An illustration showing a quadrilateral inscribed in a circle that is tangent to a line.

Quadrilateral Inscribed In A Circle

An illustration showing a quadrilateral inscribed in a circle that is tangent to a line.

An illustration showing a triangle with angles A, C, and D inscribed in a circle which is tangent to a line.

Triangle Inscribed In A Circle

An illustration showing a triangle with angles A, C, and D inscribed in a circle which is tangent to…

An illustration showing a circle with sectors D and E inscribed in a triangle with angles, A, B, and C.

Circle Inscribed In A Triangle

An illustration showing a circle with sectors D and E inscribed in a triangle with angles, A, B, and…

An illustration showing a model that illustrates the following relationships: a:x = x:a - x, x = √(a&sup2 + (a/2)&sup2 - a/2).

Model Of Geometric Proportions

An illustration showing a model that illustrates the following relationships: a:x = x:a - x, x = √(a²…

An illustration of a right triangle inscribed in a semicircle.

Right Triangle Inscribed In A Semicircle

An illustration of a right triangle inscribed in a semicircle.

An illustration showing a model of a circle with intersecting chords that illustrates the following relationship: a:c = b:d, ad = bc. Product of the means equals the product of the extremes.

Model Of Geometric Proportions In A Circle

An illustration showing a model of a circle with intersecting chords that illustrates the following…

Two students drawing geometrical shapes on the chalkboard. A student is also using a scale while students sitting at desks take notes.

Geometry

Two students drawing geometrical shapes on the chalkboard. A student is also using a scale while students…

The circle of multiples can be used as a practice game in class. The outside ring are multiples and the inner ring are factors. n represents the other factor. The teacher points to a set of numbers and students replace n with the other factor. For instance, if 72 is chosen, 8 is the factor, and n would be 9.

Multiples

The circle of multiples can be used as a practice game in class. The outside ring are multiples and…

"The bases of the pyramids are considered as forming the surface of the sphere, while the altitude of the pyramids is the radius of the sphere." -Foster, 1921

Area of Sphere

"The bases of the pyramids are considered as forming the surface of the sphere, while the altitude of…

An illustration showing a model of a circle with an exterior angle formed between a tangent and a secant that illustrates the following geometric relationship: a:t = t:b, t&sup2 = ab

Model Of Geometric Relationships In A Circle

An illustration showing a model of a circle with an exterior angle formed between a tangent and a secant…

An illustration showing a model of a circle with angles formed between tangents and secants that illustrates the following geometric relationship: t&sup2 = (a + b)(a - b).

Model Of Geometric Relationships In A Circle

An illustration showing a model of a circle with angles formed between tangents and secants that illustrates…

An illustration used to "square a circumference".

Square And Circle

An illustration used to "square a circumference".

An illustration used to "square a cirleplane".

Square And Circle

An illustration used to "square a cirleplane".

Illustration of a sector of a circle. A sector is the space between an arc and two radii drawn to the extremities of the arc.

Sector Of Circle

Illustration of a sector of a circle. A sector is the space between an arc and two radii drawn to the…

Illustration of a sector of a hollow circle. A sector is the space between an arc and two radii drawn to the extremities of the arc.

Sector Of A Hollow Circle

Illustration of a sector of a hollow circle. A sector is the space between an arc and two radii drawn…

A view from behind of a frontal section through the right elbow joint.

Frontal Section Through Elbow Joint

A view from behind of a frontal section through the right elbow joint.

A skeleton of a cow shown to illustrate the internal skeleton which all vertebrates share. Labels: 1, Frontal bone of the head. 2, Upper jaw (superior maxillary). 3. Lower jaw (inferior maxillary). 4, Cervical vertebrae. 5, Dorsal vertebrae. 6, Lumbar vertebrae. 7 Sacral vertebrae. 8, Caudal vertebrae. 9; Scapula. 10, Humerus. 11, Radius and ulna. 12, Carpus. 13, Metacarpus. 14, Phalanges (toes). 15, Femur. 16, Tibia. 17, Tarsus. 18, Metatarsus. 19, Phalanges.

Skeleton of a Cow

A skeleton of a cow shown to illustrate the internal skeleton which all vertebrates share. Labels: 1,…

A skeleton of a tortoise The ribs of which are expanded, forming the dorsal part of its shell. Labels: 1, cervical; 2, dorsal; 3, lumbar vertebra; 4, scapula; 5, clavicle; 6, coracoid bone; 13, humerus; 14, ulna; 15, radius, 16, carpus. 17, phalanges (fingers); 7, femur; 8, tibia; 9, fibula; 10, tarsus. 11, metatarsus, 12, phalanges (toes).

Skeleton of a Tortoise

A skeleton of a tortoise The ribs of which are expanded, forming the dorsal part of its shell. Labels:…

Showing the situation of Colle's fracture of the radius, with fracture of the styloid of the ulna. The usual position of a fraction of the scaphoid is also indicated.

Colle's Fraction of the Radius

Showing the situation of Colle's fracture of the radius, with fracture of the styloid of the ulna. The…

Labeled shapes showing various measures of form.

Measures of Form

Labeled shapes showing various measures of form.

Four different types of forms or shapes: right triangle, isosceles triangle, rectangle, and circle.

Shapes

Four different types of forms or shapes: right triangle, isosceles triangle, rectangle, and circle.

Illustration showing that a circle may be considered as made up of triangles whose bases form the circumference.

Triangles Making Up A Circle

Illustration showing that a circle may be considered as made up of triangles whose bases form the circumference.

Three students playing a math game in the classroom, throwing beanbags into a circle and doing multiplication problems on the chalkboard.

Math Game

Three students playing a math game in the classroom, throwing beanbags into a circle and doing multiplication…

In changing the compass from a small to large radius, hold the legs together with one hand and spin the nut with the other, in order to save wear on the threads.

Adjusting the Compass

In changing the compass from a small to large radius, hold the legs together with one hand and spin…

Front view of the bones of the forearm

Front View of the Bones of the Forearm

Front view of the bones of the forearm

Front view of the bones of the forearm

Back View of the Bones of the Forearm

Front view of the bones of the forearm

The bones of the right forearm, dorsal view.

Dorsal View of the Bones of the Forearm

The bones of the right forearm, dorsal view.

The bones of the right forearm, ventral view.

Ventral View of the Bones of the Forearm

The bones of the right forearm, ventral view.

"Shows how the head advances over half the circumference of the circle which it has to describe, and secures the end of the thread against the support."

Caterpillars of the Cabbage-Butterfly

"Shows how the head advances over half the circumference of the circle which it has to describe, and…

"Use the entire blossom mingled with buds and green leaves, all short stemmed, not longer than three or four inches. Bind the stems with string on a circle made of a piece of willow or some other pliable material, and be sure to removed the thorns from all them stems before weaving the wreath." -Beard, 1906

Wreath of roses

"Use the entire blossom mingled with buds and green leaves, all short stemmed, not longer than three…

Frontal section of the elbow, viewed from in front.

Frontal Section Through the Elbow

Frontal section of the elbow, viewed from in front.

Sagittal section of the right elbow, with the arm in pronation.

Sagittal Section of the Elbow

Sagittal section of the right elbow, with the arm in pronation.

Section three inches above the styloid process of the right radius.

Cross Section Three Inches above the Styloid Process of the Forearm

Section three inches above the styloid process of the right radius.

Section two inches above the styloid process of the right radius.

Cross Section Two Inches above the Styloid Process of the Forearm

Section two inches above the styloid process of the right radius.

Section one inch above the styloid process of the right radius.

Cross Section One Inch above the Styloid Process of the Forearm

Section one inch above the styloid process of the right radius.

Section through the styloid process of the right radius.

Cross Section Through the Styloid Process of the Forearm

Section through the styloid process of the right radius.

Fracture of upper third of ulna, with dislocation of radius forward.

Fractured Ulna with Dislocation of Radius

Fracture of upper third of ulna, with dislocation of radius forward.

Right radius, inner aspect.

Inner Aspect of Radius

Right radius, inner aspect.

Right radius from before.

Radius from Before

Right radius from before.

Right radius from behind.

Radius from Behind

Right radius from behind.

Left elbow joint, showing anterior and internal ligaments.

Elbow Showing Internal Ligaments

Left elbow joint, showing anterior and internal ligaments.

Left elbow joint, showing posterior and external ligaments.

Elbow Showing External Ligaments

Left elbow joint, showing posterior and external ligaments.

Right elbow joint, cut through at right angles to the axis of trochlea humeri, from the ulnar side.

Elbow Joint

Right elbow joint, cut through at right angles to the axis of trochlea humeri, from the ulnar side.

Bones of the right forearm,with their ligaments; volar aspect.

Bones and Ligaments of Forearm

Bones of the right forearm,with their ligaments; volar aspect.

"The <em>Crinoidea</em>, which belong to the family of starfishes, are mostly attached to marine rocks by a sort of root, having a long, flexible stem, which enables them to execute movements in the circle limited only by the length of this stem."

Pentacrinus Caput Medusae (Muller)

"The Crinoidea, which belong to the family of starfishes, are mostly attached to marine rocks…

"The whole internal cavity in these animals is occupied by little, white tubes. The mouth opens at the extremity of the body; it forms a sort of funnel, surrounded like a crown with an elegant circle of tentacula."

Cristatella Mucedo (Cuvier)

"The whole internal cavity in these animals is occupied by little, white tubes. The mouth opens at the…

Transverse section through the middle of the right forearm, in the position of semipronation.

Transverse Section Through Arm

Transverse section through the middle of the right forearm, in the position of semipronation.

Transverse section through the wrist, showing the annular ligaments and the canals for the passage of the tendons.

Transverse Section Through the Wrist

Transverse section through the wrist, showing the annular ligaments and the canals for the passage of…

Fracture of the shaft of the radius.

Fractured Radius

Fracture of the shaft of the radius.

Fracture of the lower end of the radius.

Fractured Radius

Fracture of the lower end of the radius.

Illustration showing a circle formed by the intersection of a plane perpendicular to the axis of the cone.

Circle

Illustration showing a circle formed by the intersection of a plane perpendicular to the axis of the…

Illustration showing a cycloid curve. "The curve generated by a point in the plane of a circle when the circle is rolled along a straight line and always in the same plane."

Cycloid

Illustration showing a cycloid curve. "The curve generated by a point in the plane of a circle when…

Illustration showing cycloid curves. "The curve generated by a point in the plane of a circle when the circle is rolled along a straight line and always in the same plane."

Cycloids

Illustration showing cycloid curves. "The curve generated by a point in the plane of a circle when the…

Illustration showing a cycloid curve. "The curve generated by a point in the plane of a circle when the circle is rolled along a straight line and always in the same plane."

Cycloid

Illustration showing a cycloid curve. "The curve generated by a point in the plane of a circle when…

Orbicular ligament of the radius.

Orbicular Ligament of the Radius

Orbicular ligament of the radius.

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.

Ligaments on anterior aspect of radio carpal, carpal, and carpo metacarpal joints.

Ligaments of the Wrist

Ligaments on anterior aspect of radio carpal, carpal, and carpo metacarpal joints.

Section across the forearm in the middle third. Labels: A, pronator radii teres; B, flexor carpi radialis; C, flexor sublimis digitorum; D, palmaris longus; E, flexor carpi ulnaris; F, flexor profundus digitorum; G, extensor carpi ulnaris; H, extensor longus pollicis; I, extensor communis digitorum; J, extensor ossis metacarpi pollicis; K, extensor carpi radialis brevior; L, extensor carpi radialis longior; M, brachio-radialis; a, radius; b, interosseous membrane; c, ulna; 1, radial nerve; 2, radial artery; 3, anterior interosseous artery; 4, anterior interosseons nerve (underneath flexor longus pollicis); 5, median nerve; 6, ulnar artery; 7, ulnar nerve; 8, posterior interosseous artery; 9, posterior interosseous nerve.

Section Across Forearm

Section across the forearm in the middle third. Labels: A, pronator radii teres; B, flexor carpi radialis;…

The muscles and nerves on the front of the forearm and hand. The pronator radii teres, flexor carpi radialis, and palmaris longus have been removed.

Muscles and Nerves of the Forearm

The muscles and nerves on the front of the forearm and hand. The pronator radii teres, flexor carpi…

From Kipling's The Jungle Book, Baloo singing the Law of the Jungle to a pack of wolves.

Baloo Singing to Wolves

From Kipling's The Jungle Book, Baloo singing the Law of the Jungle to a pack of wolves.