This mathematics ClipArt gallery offers 14 images of angles that are often used in trigonometry. Images include angles in all four quadrants, positive and negative angles, reference angles, and angles of depression and elevation.

Angles used to illustrate the sum and difference of two angles and trig identities.

Illustration of two triangles, showing the sine of the sum of two acute angles expressed in terms of…

Lines drawn to horizontal to form triangle ratios (reference triangles, angles).

Lines drawn to horizontal to form triangle ratios (reference triangles, angles). Axes, quadrants, abscissa,…

Coordinate axis with angle XOP equal to theta, Θ, and angle XOQ=180 - Θ. From any point in the terminal…

Illustration that can be used to show that if the cotangent of an angle is negative the angle must terminate…

Illustration showing an angle of depression from a horizontal line to a line of sight.

Illustration showing an angle of elevation from a horizontal line to a line of sight.