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"A strange triangular bridge at Croyland was probably built for or by a religious body. This structure stands at the confluence of the Welland, the Nyne, and the Catwater drain; three pointed arches, having their abutments at the angles of an equilateral triangle, meet in the middle, giving three watercourses and three roadways." — Encyclopedia Britanica, 1893

Croyland Bridge

"A strange triangular bridge at Croyland was probably built for or by a religious body. This structure…

An illustration of a crystal showing triangular markings.

Crystal

An illustration of a crystal showing triangular markings.

A flashcard featuring an illustration of a Pyramid with a Triangular Base

Flashcard of a Pyramid with a Triangular Base

A flashcard featuring an illustration of a Pyramid with a Triangular Base

The frustum of a triangular pyramid is equivalent to the sum of three pyramids whose common altitude is the altitude of the frustum and whose bases are the lower base, the upper base, and the mean proportional between the two bases of the frustum.

Triangular Pyramid Frustum

The frustum of a triangular pyramid is equivalent to the sum of three pyramids whose common altitude…

A hand with the index finger bandaged.

Hand with bandaged finger

A hand with the index finger bandaged.

A leaf shaped like a triangle.

Sagittate Leaf

A leaf shaped like a triangle.

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 a parallelopiped with a plane passing through two diagonally opposite edges. The plane divides the parallelopiped into two equivalent triangular prisms.

Parallelopiped with Plane Passing Through

Illustration of a parallelopiped with a plane passing through two diagonally opposite edges. The plane…

Illustration of a parallelopiped with a plane passing through two diagonally opposite edges. The plane divides the parallelopiped into two equivalent triangular prisms.

Parallelopiped with Plane Passing Through

Illustration of a parallelopiped with a plane passing through two diagonally opposite edges. The plane…

Triangle, triangular polygon

Triangular Polygon

Triangle, triangular polygon

Illustration of a right rectangular pyramid with hidden edges shown. The base is a rectangle and the faces are isosceles triangles.

Rectangular Pyramid

Illustration of a right rectangular pyramid with hidden edges shown. The base is a rectangle and the…

Illustration of a right rectangular pyramid with hidden edges shown. The base is a rectangle and the faces are isosceles triangles. The height of the pyramid is much larger then the length and width of the base.

Rectangular Pyramid

Illustration of a right rectangular pyramid with hidden edges shown. The base is a rectangle and the…

Illustration of a right rectangular pyramid with hidden edges shown. The base is a rectangle and the faces are isosceles triangles.

Rectangular Pyramid

Illustration of a right rectangular pyramid with hidden edges shown. The base is a rectangle and the…

Illustration of a right rectangular pyramid with hidden edges shown. The base is a rectangle and the faces are isosceles triangles.

Rectangular Pyramid

Illustration of a right rectangular pyramid with hidden edges shown. The base is a rectangle and the…

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…

"Showing how the Bones of the Skull may be artificially deformed by "head-binding." From the photograph of a "triangular" skull found in an Indian grave in Ancon, Peru." — Blaisedell, 1904

Deformed skull

"Showing how the Bones of the Skull may be artificially deformed by "head-binding." From the photograph…

"A sling for the arm made from a triangular bandage." —Davison, 1910

Boy with sling

"A sling for the arm made from a triangular bandage." —Davison, 1910