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,…

Illustration of one possible outcome (no triangle occurs) when discussing the ambiguous case using the…

Illustration of one possible outcome (1 triangle occurs) when discussing the ambiguous case using the…

Illustration of one possible outcome (2 triangles occur) when discussing the ambiguous case using the…

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…

Illustration of a unit circle (circle with a radius of 1) superimposed on the coordinate plane. The…

Illustration of a unit circle (circle with a radius of 1) superimposed on the coordinate plane with…

Illustration of a unit circle (circle with a radius of 1) superimposed on the coordinate plane with…

Illustration of a unit circle (circle with a radius of 1) superimposed on the coordinate plane with…

Illustration of a unit circle (circle with a radius of 1) superimposed on the coordinate plane with…

Illustration of a unit circle (circle with a radius of 1) superimposed on the coordinate plane with…

Illustration of a unit circle (circle with a radius of 1) superimposed on the coordinate plane with…

Illustration of a unit circle (circle with a radius of 1) superimposed on the coordinate plane with…

Illustration of a unit circle (circle with a radius of 1) superimposed on the coordinate plane. All…

Illustration of a unit circle (circle with a radius of 1) superimposed on the coordinate plane with…

Illustration of a unit circle (circle with a radius of 1) superimposed on the coordinate plane with…

Illustration of a unit circle (circle with a radius of 1) superimposed on the coordinate plane. At each…

Illustration of a unit circle (circle with a radius of 1) superimposed on the coordinate plane with…

Illustration of a unit circle (circle with a radius of 1) superimposed on the coordinate plane with…

Illustration of a unit circle (circle with a radius of 1) superimposed on the coordinate plane with…

Illustration of a unit circle (circle with a radius of 1) superimposed on the coordinate plane with…

Illustration of a unit circle (circle with a radius of 1) superimposed on the coordinate plane. All…

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

Illustration of the projection of point P as it moves around a vertical circle of radius 3 in. in a…

Illustration of the projection of point P as it moves around a vertical circle of radius 2 ft. in a…

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

Angle XOP=Θ and angle XOQ=- Θ. From a point in the terminal side of each a perpendicular line is drawn…

Angle XOP=Θ and angle XOQ=90+Θ. From a point in the terminal side of each a perpendicular line is…

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

Illustration showing coterminal angles of 0° and -360°. Coterminal angles are angles drawn in…

Illustration showing coterminal angles of 0° and -360°. Coterminal angles are angles drawn in…

Illustration showing coterminal angles of 0° and -360°. Coterminal angles are angles drawn in…

Illustration showing coterminal angles of 0° and -360°. Coterminal angles are angles drawn in…

Illustration showing coterminal angles of 10° and -350°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 10° and -350°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 10° and -350°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 10° and -350°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 100° and -260°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 100° and -260°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 100° and -260°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 100° and -260°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 105° and -255°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 105° and -255°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 105° and -255°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 105° and -255°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 110° and -250°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 110° and -250°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 110° and -250°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 110° and -250°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 115° and -245°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 115° and -245°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 115° and -245°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 115° and -245°. Coterminal angles are angles drawn…

Illustration showing coterminal angles of 120° and -240°. Coterminal angles are angles drawn…