The unit circle

Coordinates as cosine and sine of the angle, exact values at the key angles, and reference angles.

Standards:F-TF.A.2

Try it: three questions

Real questions from the practice bank. Tap an answer to check it.

Question 1 of 2

A point P moves on the unit circle. If P is at angle 150° from the positive x-axis, what is the y-coordinate of P?

Question 2 of 2

A point P on the unit circle is located at angle 210° measured counterclockwise from the positive x-axis. What is the y-coordinate of point P?

How this fits in

The unit circle is one skill in the Trigonometry unit. Students read the unit lesson, then earn a bronze, silver, or gold medal on their last 10 answers. Medals never go down. A mastered unit comes back for review after 1, 3, 7, 16, and 35 days so it stays learned.

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