Three Points Generate Every Exact Value

You'll learnto generate every special-angle value from three first-quadrant points.

The exact-value table looks long, and it is really three points. Every other special angle folds onto one of them, and the quadrant supplies the signs. Twelve short steps; press Next for each one.

12 STEPS · 6 QUICK CHECKS · SPECIAL ANGLES · REFERENCE ANGLES · SIGNS · v3

fold to the reference angle, then read the signs

Before you start

What you're looking at

A point sliding round the unit circle, with its width and height marked.

The question

Which angles land on points you can write down exactly, and what are they?

Step 1 / 12