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Illustration used to show finding the volume of a triangular prism.

Volume Of Triangular Prism

Illustration used to show finding the volume of a triangular prism.

Illustration used to show finding the volume of a square prism.

Volume Of Square Prism

Illustration used to show finding the volume of a square prism.

Illustration used to show finding the volume of a pentagonal prism.

Volume Of Pentagonal Prism

Illustration used to show finding the volume of a pentagonal prism.

Illustration used to show finding the volume of a pentagonal prism.

Volume Of Cylinder

Illustration used to show finding the volume of a pentagonal prism.

Illustration used to compare the volumes of a pyramid and a prism by emptying sand from the pyramid into the prism.

Comparative Volumes Of A Pyramid And Prism

Illustration used to compare the volumes of a pyramid and a prism by emptying sand from the pyramid…

Illustration of a 1 in. by 2 in. by 1 in. rectangular solid that is similar to a 2 in. by 4 in. by 2 in. rectangular solid.

Similar Rectangular Solids

Illustration of a 1 in. by 2 in. by 1 in. rectangular solid that is similar to a 2 in. by 4 in. by 2…

"The Hoopoes have long, slender, triangular and slightly-curved beaks."

Hoopoes (Upupa Epops)

"The Hoopoes have long, slender, triangular and slightly-curved beaks."

Various geometric solids, mostly rectangular prisms with a cylinder and a hexagonal prism.

Solids

Various geometric solids, mostly rectangular prisms with a cylinder and a hexagonal prism.

"This was the beginning of a cocoon. Each triangular blade was composed of a great number of small, thin, rectangular plates, taken from the bark of the tree."

Cocoon of Pyralis Corticalis

"This was the beginning of a cocoon. Each triangular blade was composed of a great number of small,…

Shown is the mylohyoid muscle. The mylohyoid muscle is a flat, triangular muscle situated beneath the interior belly of the Digastric, forming the muscular floor for the cavity of the mouth.

Mylohyoid Muscle

Shown is the mylohyoid muscle. The mylohyoid muscle is a flat, triangular muscle situated beneath the…

Angels sitting on either side of a box.

Triangular Doodad

Angels sitting on either side of a box.

Carpal articular surface of the radius, and triangular fibro cartilage of the wrist.

Carpal Articular Surface of the Radius

Carpal articular surface of the radius, and triangular fibro cartilage of the wrist.

An illustration of two pyramids. A pyramid is a building where the upper surfaces are triangular and converge on one point. The base of pyramids are usually quadrilateral or trilateral (but generally may be of any polygon shape), meaning that a pyramid usually has three or four sides. A pyramid's design, with the majority of the weight closer to the ground, means that less material higher up on the pyramid will be pushing down from above.

Pyramids

An illustration of two pyramids. A pyramid is a building where the upper surfaces are triangular and…

Double Porro prism systems are used in small optical telescopes to re-orient an inverted image, and especially in many binoculars where they both erect the image and provide a longer, folded distance between the objective lenses and the eyepieces.

Porro Prism

Double Porro prism systems are used in small optical telescopes to re-orient an inverted image, and…

A Crow-stepped gable is a stair-step type of design at the top of the triangular gable-end of a building. The top of the parapet wall projects above the roofline and the top of the brick or stone wall is stacked in a step pattern above the roof as a decoration and as a convenient way to finish the brick courses. "The word corbie or corby, though obsolete in English, except as a heraldic term, has retained its place in the Scottish dialect, and in architecture to signify the succession of steps with which the gables of old houses are everywhere ornamented in Scotland. The fashion, like most of the other peculiarities of Scottish architecture, was no doubt borrowed, as was the term, from France." — Chambers, 1881

Crow-stepped Gable

A Crow-stepped gable is a stair-step type of design at the top of the triangular gable-end of a building.…

An illustration depicting the formation of circles of diffusion. "From point A luminous rays enter the eye in the form of a cone, the kind of which will depend on the pupil. Thus it may be circular, or oval, or ever triangular. If the pencil is focused in front of the retina, as at d, or behind it as it as at f, or, in other words, if the retina of being at F; be in the position G or H, there will be a luminous circle or a luminous triangular space, and many elements of the retina will be affected. The size of these diffusion circles depends on the distance from the retina of the point where the rays are focused: the greater the distance, the more extended will be the diffusion circle" (Britannica, 132).

Formation of Circles of Diffusion

An illustration depicting the formation of circles of diffusion. "From point A luminous rays enter the…

A pendentive is a constructive device permitting the placing of a circular dome over a square room or an elliptical dome over a rectangular room. The pendentives, which are triangular segments of a sphere, taper to points at the bottom and spread at the top to establish the continuous circular or elliptical base needed for the dome. In masonry the pendentives thus receive the weight of the dome, concentrating it at the four corners where it can be received by the piers beneath.

Diagram of Pendentives

A pendentive is a constructive device permitting the placing of a circular dome over a square room or…

"Zircon, a mineral composed of of zirconium silicate, sometimes used as a gem-stone... THe mineral crystallizes in the tetragonal system, generally in combinations of square prisms and square pyramids" (Britannica, 1910).

Zircon

"Zircon, a mineral composed of of zirconium silicate, sometimes used as a gem-stone... THe mineral crystallizes…

"Zircon, a mineral composed of of zirconium silicate, sometimes used as a gem-stone... THe mineral crystallizes in the tetragonal system, generally in combinations of square prisms and square pyramids." -Britannica, 1910

Zircon

"Zircon, a mineral composed of of zirconium silicate, sometimes used as a gem-stone... THe mineral crystallizes…

A gable is the generally triangular portion of a wall between the edges of a sloping roof. A wimperg is a German and Dutch word for a Gothic ornamental gable with tracery over windows or portals, which were often accompanied with pinnacles. It was a typical element in Gothic Architecture especially in cathedral architecture. Wimpergs often had crockets or other decorative elements in the Gothic style. The intention behind the wimperg was the perception of increased height.

Openwork Gable, From Front of Rouen Cathedral

A gable is the generally triangular portion of a wall between the edges of a sloping roof. A wimperg…

An illustration of a crystal showing triangular markings.

Crystal

An illustration of a crystal showing triangular markings.

Lamium album (White Deadnettle) is a flowering plant in the family Lamiaceae, native throughout Europe and western Asia, growing in a variety of habitats from open grassland to woodland, generally on moist, fertile soils. It is a herbaceous perennial plant growing to 50-100 cm tall, with green, four-angled stems. The leaves are 3-8 cm long and 2-5 cm broad, triangular with a rounded base, softly hairy, and with a serrated margin and a petiole up to 5 cm long; they appear superficially similar to those of the Stinging nettle Urtica dioica but do not sting, hence the common name "dead nettle". The flowers are white, produced in whorls ('verticillasters') on the upper part of the stem, the individual flowers 1.5-2.5 cm long

Lamium Album

Lamium album (White Deadnettle) is a flowering plant in the family Lamiaceae, native throughout Europe…

Principal forms of the isometric system: rectangular prism.

Rectangular Prism

Principal forms of the isometric system: rectangular prism.

Principal forms of the hexagonal system: dihexagonal prism

Dihexagonal Prism

Principal forms of the hexagonal system: dihexagonal prism

Principal forms of the hexagonal system: hexagonal prism

Hexagonal Prism Second Order

Principal forms of the hexagonal system: hexagonal prism

Principal forms of the hexagonal system: hexagonal prism

Hexagonal Prism First Order

Principal forms of the hexagonal system: hexagonal prism

Principal forms of the hexagonal system: trigonal prism

Trigonal Prism

Principal forms of the hexagonal system: trigonal prism

Principal forms of the hexagonal system: ditrigonal prism

Ditrigonal Prism

Principal forms of the hexagonal system: ditrigonal prism

Principal forms of the triclinic system: triclinic hemi-prism

Triclinic Hemi-prism

Principal forms of the triclinic system: triclinic hemi-prism

"The shield carried by a mounted man-at-arms in the middle ages; especially, the triangular shield of no great length carried during the thirteenth and fourteenth centuries, and hung around the neck by the guige, so as to cover the left arm and left side." -Whitney, 1911

Écu

"The shield carried by a mounted man-at-arms in the middle ages; especially, the triangular shield of…

The triangular panel is found at the stall of the Laurentian Library in Florence, Italy. It was ascribed to Michael Angelo.

Triangular Panel

The triangular panel is found at the stall of the Laurentian Library in Florence, Italy. It was ascribed…

The triangular panel is found at the stall of the Laurentian Library in Florence, Italy. It was ascribed to Michael Angelo.

Triangular Panel

The triangular panel is found at the stall of the Laurentian Library in Florence, Italy. It was ascribed…

The triangular panel is found at the stall of the Laurentian Library in Florence, Italy. It was ascribed to Michael Angelo.

Triangular Panel

The triangular panel is found at the stall of the Laurentian Library in Florence, Italy. It was ascribed…

The triangular panel is found at the stall of the Laurentian Library in Florence, Italy. It was ascribed to Michael Angelo.

Triangular Panel

The triangular panel is found at the stall of the Laurentian Library in Florence, Italy. It was ascribed…

Illustration of the projection of a rectangular prism that is represented as if it were standing on one of its small ends, with the broad side toward the observer.

Projection Of Rectangular Prism

Illustration of the projection of a rectangular prism that is represented as if it were standing on…

Illustration of the projection of a wedge of a rectangular prism that is standing on one of its triangular sides.

Projection Of Wedge

Illustration of the projection of a wedge of a rectangular prism that is standing on one of its triangular…

Illustration of the projection of a wedge of a rectangular prism that is standing on one of its rectangular sides.

Projection Of Wedge

Illustration of the projection of a wedge of a rectangular prism that is standing on one of its rectangular…

Illustration of the projection of a wedge of a rectangular prism that is viewed from the side.

Projection Of Wedge

Illustration of the projection of a wedge of a rectangular prism that is viewed from the side.

Illustration of the projection of a hexagonal prism.

Projection Of Hexagonal Prism

Illustration of the projection of a hexagonal prism.

Illustration of the projection of a hexagonal prism.

Projection Of Hexagonal Prism

Illustration of the projection of a hexagonal prism.

Illustration of the projection of a rectangular prism whose broad side makes an angle of 30° with the horizontal.

Projection Of Rectangular Prism

Illustration of the projection of a rectangular prism whose broad side makes an angle of 30° with…

Illustration of the projection of a rectangular prism whose base makes an angle of 160° with the horizontal.

Projection Of Rectangular Prism

Illustration of the projection of a rectangular prism whose base makes an angle of 160° with the…

Illustration of the projection of a rectangular prism whose base makes an angle of 17.5° with the horizontal.

Projection Of Rectangular Prism

Illustration of the projection of a rectangular prism whose base makes an angle of 17.5° with the…

Illustration of the projection of a hexagonal prism having two of its parallel sides parallel to the plane of the paper, and its axis vertical. instead of a side elevation at right angles to the horizontal, the angle is 30° with the horizontal.

Projection Of Hexagonal Prism

Illustration of the projection of a hexagonal prism having two of its parallel sides parallel to the…

Illustration of the projection of a hexagonal prism whose axis is parallel to the plane of the paper and whose base makes and angle of 30° with the horizontal.

Projection Of Hexagonal Prism

Illustration of the projection of a hexagonal prism whose axis is parallel to the plane of the paper…

Illustration of the intersection of a quadrangular prism and an octagonal prism. The figures intersect at a right angle.

Intersecting Prisms

Illustration of the intersection of a quadrangular prism and an octagonal prism. The figures intersect…

Illustration of the intersection of an octagonal prism and a cylinder. The figures intersect at an oblique angle.

Intersecting Prism and Cylinder

Illustration of the intersection of an octagonal prism and a cylinder. The figures intersect at an oblique…

Illustration of the development of a rectangular prism. "Assume now that the prism is laid on the drawing board, the surface A face down, and the paper covering removed by turning the prism over and over, the paper remaining on the surface of the drawing board, as shown..."

Development Of Rectangular Prism

Illustration of the development of a rectangular prism. "Assume now that the prism is laid on the drawing…

Illustration showing the intersection of a plane with an octagonal prism.

Plane Intersecting Octagonal Prism

Illustration showing the intersection of a plane with an octagonal prism.

Illustration of an irregular solid form made up of triangular surfaces on a flat surface.

Irregular Solid With Triangular Surfaces

Illustration of an irregular solid form made up of triangular surfaces on a flat surface.

Illustration of an irregular solid form made up of triangular surfaces unfolded on a flat surface. A is the center and the radius is equal to AB.

Irregular Solid With Triangular Surfaces

Illustration of an irregular solid form made up of triangular surfaces unfolded on a flat surface. A…

"Files. a, cotter-file when large, and verge- or pivot-file when small; b, square file (parallel or taper); c, banking or watch-pinion file when parallel, and knife-file when tape; d, half-round, nicking, piercing, or round-off file; e, round, gulleting, or rat-tail file; f, triangular, three-square, or saw file; g, equaling, clock-pinion, or endless-screw file when parallel, and slitting, entering, warding, or barrel-hole file when tape; h, cross- or double-half-round file; i, screw-head, feather-edge, or slitting file." -Whitney, 1911

Types of Files

"Files. a, cotter-file when large, and verge- or pivot-file when small; b, square file (parallel or…

A simple pointed triangle shape of a shield or escutcheon in heraldry.

Pointed Triangular Shield

A simple pointed triangle shape of a shield or escutcheon in heraldry.

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures consisting of triangles, squares, and parallelograms are used to construct the given shape. This tangram depicts a triangular double arch.

Triangular Double Arch

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures…

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures consisting of triangles, squares, and parallelograms are used to construct the given shape. This tangram depicts a triangular double arch.

Triangular Double Arch

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures…

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures consisting of triangles, squares, and parallelograms are used to construct the given shape. This tangram depicts a triangular double arch.

Triangular Double Arch

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures…

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures consisting of triangles, squares, and parallelograms are used to construct the given shape. This tangram depicts a triangular double arch.

Triangular Double Arch

Tangrams, invented by the Chinese, are used to develop geometric thinking and spatial sense. Seven figures…

Diagram used to prove the theorem: "The lateral area of a prism is equal to the product of a lateral edge by the perimeter of a right section."

Lateral Area of A Prism

Diagram used to prove the theorem: "The lateral area of a prism is equal to the product of a lateral…

Diagram used to prove the theorem: "Two prisms are equal when the three faces about a trihedral of one are equal respectively to the three faces about a trihedral of the other, and similarly arranged."

Two Equal Prisms

Diagram used to prove the theorem: "Two prisms are equal when the three faces about a trihedral of one…

Illustration of an oblique prism constructed by the combination of three truncated prisms.

Oblique Prism Truncated Into 3 Sections

Illustration of an oblique prism constructed by the combination of three truncated prisms.