Illustration of a sphere with a tangent plane. "A plane perpendicular to a radius at its extremity is…

Illustration of a sphere with a polyhedral angle whose vertex is at the center of the sphere and whose…

A sphere with quadrants and poles. "A point on the surface of a sphere, which is at the distance of…

A wooden hollow sphere created by using a lathe and wooden templet at a desired diameter.

Illustration of equal spheres with equilateral and equiangular triangles.

Illustration of two intersecting spheres. "The intersection of two spherical surfaces is the circumference…

An illustration showing how to construct a square circumscribed about a circle. "Draw the diameters…

An illustration showing how to construct a square inscribed in a circle. "Draw the diameter AB, and…

Illustration used to show how to inscribe a square in a given circle.

An illustration of a circle inscribed in a square. It can be used to show that the area of a circle…

An illustration showing how to construct a talon, or two circle arcs that will tangent themselves, and…

An illustration showing how to construct a tangent between 2 given circles. "Join the centers C and…

An illustration showing how to construct a tangent to 2 given circles of different diameters. "Join…

An illustration showing how to construct a tangent circle to 2 given circles. "Join centers C and c…

Illustration used to show how "to construct a tangent to a circle from a point outside."

An illustration showing how to construct a tangent to a circle through a given point in a circumference.…

An illustration showing how to construct a tangent to a circle through a given point outside of a circumference.…

An illustration showing how to construct a tangent circle to a circle with a given radius. "Through…

Cylindrical water tank with a height of 10 ft., thickness of 3 inches, and diameter of 3 feet. The diagram…

The exercise problem of creating a three piece elbow development or rolled out image of the cylinder…

An illustration showing a circle with radius r inscribed in a triangle with sides a, b, and c.

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

Illustration used to circumscribe a circle about a given triangle.

Illustration used to escribe a circle to a given triangle. "A circle which is tangent to one side of…

Illustration used to inscribe a circle in a given triangle.

"A circle may be considered as made up of triangles whose bases form the circumference, and whose altitude…

An illustration showing how to construct two circles that tangent themselves and two given lines. "Draw…

This pocket watch has a unique design on its back of leaves and circles. The circular handle at the…

Cross section of Pullman car water tank. The diagram can be used to find volume.