K–12 · intermediate
Trigonometry
Right triangles, the unit circle, and the core trig toolkit.
Skills
13 skills in 4 sections — fundamentals first, then more specific topics. Practice each until Mastery Score 100.
A.Right-triangle trig2 skills
B.Unit circle & reference angles7 skills
- B.1 Degrees & RadiansPractice →Convert between degree and radian measure.
- B.2 Unit Circle ValuesPractice →Recall exact sine and cosine at common angles.
- B.3 Coordinates on the Unit CirclePractice →Read exact sine and cosine coordinates from a unit-circle diagram.
- B.4 Exact Trig ValuesPractice →Recall exact sin, cos, and tan of special angles in degrees.
- B.5 Reference AnglesPractice →Find the reference angle for an angle in degrees.
- B.6 Coterminal AnglesPractice →Find the coterminal angle between 0° and 360°.
- B.7 Cofunction ValuesPractice →Use sin(90° − θ) = cos θ and related cofunctions.