This mathematics ClipArt gallery offers 9 illustrations of circles that are often used in trigonometry. Included are images showing arcs, angles, chords, and radians.

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

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…

The coversedsine is equal to 1 minus the sine. In this figure, AE is parallel to OB; hence, EO = AC…

"If AOB is an angle of 1 ° on the larger circle, it is also 1 ° on the smaller concentric circle,…

Illustration showing that the radian is an angle that when placed at the center of a circle its sides…

A secant is "a line which cuts a figure in any way. Specifically, in trigonometry, a line from the center…

"In trigonometry, the arcs of circles are used to measure angles. All angles are supposed to have their…