Maths · Trigonometry · Memory
Five drills. Angle to point: read the angle, choose (cos, sin). Point to angle: name the highlighted spot. Convert: degrees and radians, both ways. Function: exact sin, cos, or tan. Tap: click that spot on the circle.
Keys 1–4 pick an answer. On the circle, Tab or the arrow keys move between spots and Enter confirms.
Quadrant I is 0°, 30°, 45°, 60°, 90°. All quadrants is the full 16.
A miss shows the reference angle, the quadrant sign — All Students Take Calculus: I all positive, II sine, III tangent, IV cosine — and the 1-2-3 pattern √1/2, √2/2, √3/2 for sine of 30°, 45°, 60°.
Cards you miss come back more often. Streak, accuracy, and the 60-second best stay in this browser.
Exact values only, for the sixteen standard angles. Start in quadrant I, then open the whole circle. The picture lives on the unit circle page; this one is the drill. Pair it with the maths hub.
Angle to point
All sixteen angles, with the label on each spot. Hide them and bring a point back when you want the degree, the radian, and the exact coordinates.
Click a point to hide or reveal it.
All Students Take Calculus. Quadrant I, all of sine, cosine, and tangent are positive. II, sine only. III, tangent only. IV, cosine only. Sine of 30°, 45°, 60° runs √1/2, √2/2, √3/2. Cosine runs that pattern backwards.
Educational drill for the standard unit-circle values. Not a substitute for a course or an exam-board syllabus.