Radians & the Unit Circle REVIEW

Front

What is a radian?

Back

A radian is a unit of angular measure defined as the angle subtended at the center of a circle by an arc equal in length to the radius of the circle.

Front

How many radians are in a full circle?

Back

There are 2π radians in a full circle.

Front

What is the relationship between degrees and radians?

Back

Front

What is a coterminal angle?

Back

Coterminal angles are angles that share the same terminal side when drawn in standard position. They can be found by adding or subtracting multiples of 360° (or 2π radians).

Front

Find the coterminal angle of -700°.

Back

The coterminal angle of -700° is 20°.

Front

What is a reference angle?

Back

A reference angle is the acute angle formed by the terminal side of an angle and the x-axis. It is always positive and less than 90°.

Front

How do you find the reference angle for an angle in the first quadrant?

Back

The reference angle is the angle itself.

Front

How do you find the reference angle for an angle in the second quadrant?

Back

Front

How do you find the reference angle for an angle in the third quadrant?

Back

Front

How do you find the reference angle for an angle in the fourth quadrant?

Back