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.

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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 the reference angle for an angle in standard position?

Back

The reference angle is the acute angle formed by the terminal side of the angle and the x-axis.

Front

What is the sine of 30 degrees?

Back

Front

What is the cosine of 60 degrees?

Back

Front

What is the tangent of 45 degrees?

Back

1.

Front

What are co-terminal angles?

Back

Co-terminal angles are angles that differ by a multiple of 360 degrees or 2π radians.

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