Trigonometry Vocab Words

Brandon Carroll


a unit of angle, equal to an angle at the center of a circle whose arc is equal in length to the radius


a unit of measurement of angles, one three-hundred-and-sixtieth of the circumference of a circle

Initial Side-

a stationary straight line that contains a point about which another straight line is rotated to form an angle

Terminal Side-

an angle is in standard position if its vertex is located at the origin and one ray is on the positive x-axis

Coterminal Angle-

angles which, drawn in standard position, share a terminal side

Reference Angle-

the smallest angle between the terminal side and the x-axis

Unit Circle-

a circle with a radius of one

Trig Ratios (Sine, Cosine, Tangent, Secant, Cosecant, Cotangent)-

the six trigonometric ratios relate the sides of a right triangle to its angles