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

"A heavy, springless wagon, usually covered with a screen as shelter from the rays of the sun, drawn…

Illustration of a circle which illustrates that through three points not in a straight line one circumference,…

Illustration of a circle which illustrates that the tangents to a circle drawn from an external point…

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…

"When the pendulum is drawn from its vertical position, the force of gravity, MG, is resolved into two…

"When publishing orderes, calling the roll, etc., the saber is held suspended from the right wrist by…

Spiral with lines AB and CD drawn on piece of paper shown flat.

Spiral with lines AB and CD drawn on piece of paper and rolled into a cylinder to form spiral running…

Triangle ABC with sides a,b,c labeled and angles A,B,C labeled and h labeled as height.

Triangle ABC with sides a,b,c labeled and angles A,B,C labeled and h labeled as height.

Right triangle OCB that can be used to show the relationships between x, y, r, and Θ.