What angles are covered?

The 16 reference angles: 0°, 30°, 45°, 60°, 90°, 120°, 135°, 150°, 180°, 210°, 225°, 240°, 270°, 300°, 315°, and 330°. Three families · multiples of 30°, multiples of 45°, and the four axis-crossings.

Why exact fractions instead of decimals?

Real trig fluency means knowing sin(30°) = 1/2, not 0.5. Exact values are what you actually use in calculus integrals, physics formulas, and engineering derivations · the decimal form is a computed artefact, not the answer. Memorising the exact values is what makes downstream maths possible without a calculator.

What happens at 90° and 270° for tangent?

Tangent is undefined at those angles because tan = sin/cos and cos(90°) = cos(270°) = 0 · division by zero. The game shows "undefined" as an answer choice and that's the correct pick for those rounds.

How does difficulty work?

Difficulty 1-2 drills sin and cos in quadrant I (0-90°) · the foundational set. Difficulty 3-6 adds tangent and extends to 180°. Difficulty 7-10 covers all three functions across all four quadrants, so you have to handle the sign rules (cos negative in Q2-Q3, sin negative in Q3-Q4) as well as the magnitudes.

Trig Drills | PlayMemorize

sin, cos, tan - pick the right value for any reference angle. Drills from 0° to 360° across all four quadrants

Recall exact sin, cos, and tan values for the 16 reference angles. JavaScript required.

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