"Draw lines parallel to AB and CD at distant R from them. The intersection of these lines will be center…

Illustration used to show how to "find an arc of a circle having a known radius, which shall be equal…

Bones of the arm and hand. Labels: a, large end of ulna; b, radius; c, small end of the ulna; d, carpal…

The skeleton of the arm and leg. Labels: H, the humerus; Cd, its articular head which fits into the…

"The bones of the arm. a, humerus; b, ulna; c, radius; d, the carpus; e, the fifth metacarpal; f, the…

Bones of the arm. Labels: A, arm in supination; B, arm in pronation. H, humerus; R, radius; U, ulna.

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

"A current is caused to pass from the mercury through C along the radius of the disc A through the field…

An illustration of a vertical cross section of the spherical zones of a casting with a diameter of 16…

An illustration showing how to construct a center and radius of a circle that will tangent the three…

A circle with labels for radius, diameter, and circumference. The visual will help to remember what…

Illustration used to show that "A tangent to a circle is perpendicular to the radius drawn to the point…

Equal circles inside and tangent to the outside circle, also tangent to each other

Illustration of circle with 10 inch diameter and square.

Circle with 36 degree angles marked. This diagram can be used with the following trig problem: Locate…

An illustration used to show how the area of a circle is calculated. Area is equal to the product of…

Circle modeling the earth. O is the center of the earth, r the radius of the earth, and h the height…

Circle with chord AB=2 ft. and radius OA = 3 ft.. Triangle AOC is a right triangle. Angle AOC=half angle…

Illustration of a circle with diameter AB. Radii are RO, SO, AO, and BO. ED is a chord.

Illustration of a circle with diameter BC, chord DF, secant MN, and tangent HK.

Illustration showing a circle with a diameter, radius, and segment drawn.

Illustration showing a circle with a diameter, radius, lines, triangle, and segment drawn.

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

Illustration of circle with radius of 4000, and triangle with 45 degree angle enclosed.

An illustration showing a circle with radius r, diameter d, and chord c.

Illustration of circle with diameter and segment used to find area.

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

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

Illustration showing a circle with an inscribed triangle and radii.

Illustration showing a circle with various chords and tangents drawn.

Illustration showing a circle with various chords and tangents drawn.

Illustration of three circles enclosed in an equilateral triangle.

Illustration of of construction of a radius when given only a part of the circumference.

Illustration of of construction of a radius when given only a part of the circumference.

Illustration of blueprint used by highway engineers to widen the pavement on the inside of the curve…

"Differential Lens.—Horizontal divergence may be obtained to any required amount by varying the radius…

"Differential Lens.—Horizontal divergence may be obtained to any required amount by varying the radius…

"Differential Lens.—Horizontal divergence may be obtained to any required amount by varying the radius…

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

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

"Right fore foot of Indian Elephant. U, ulna; R, radius; c, cunelform; l, lunar; sc, scaphold; u, unciform;…

Illustration of half of an ellipse. "The ordinates of two corresponding points in an ellipse and its…