The Unit Circle

Front

What is the value of sine at 150°?

Back

1/2

Front

What is cos 60°?

Back

1/2

Front

What is the value of cosine at 315°?

Back

√2 / 2

Front

How many degrees is π/2 radians?

Back

90°

Front

What is sin 45°?

Back

√2 / 2

Front

Define the Unit Circle.

Back

A circle with a radius of 1 centered at the origin of a coordinate plane, used to define trigonometric functions.

Front

What is the sine function in relation to the Unit Circle?

Back

The sine of an angle is the y-coordinate of the point on the Unit Circle corresponding to that angle.

Front

What is the cosine function in relation to the Unit Circle?

Back

The cosine of an angle is the x-coordinate of the point on the Unit Circle corresponding to that angle.

Front

What is the tangent function in relation to the Unit Circle?

Back

The tangent of an angle is the ratio of the sine to the cosine of that angle (tan(θ) = sin(θ)/cos(θ)).

Front

What are the coordinates of the point at 0° on the Unit Circle?

Back

(1, 0)