1st quadrant unit circle intro

Front

What direction are positive angles measured from on the unit circle?

Back

Counterclockwise.

Front

What is the radius length of a unit circle?

Back

1.

Front

How are the coordinates of points on the unit circle expressed?

Back

In the form (cos(θ), sin(θ)).

Front

What does the y-coordinate on the unit circle represent?

Back

sin(θ).

Front

What does the x-coordinate on the unit circle represent?

Back

cos(θ).

Front

What is the value of sin(90°)?

Back

1.

Front

What is the value of cos(0°)?

Back

1.

Front

What is the value of sin(0°)?

Back

0.

Front

What is the value of cos(90°)?

Back

0.

Front

What is the relationship between the angles in the first quadrant?

Back

All angles are positive and less than 90°.