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Home › Calculators › Trigonometry Calculators › Coterminal & Reference Angles

Coterminal & Reference Angles

Find coterminal angles and the reference angle for any rotation.
Input Values
°

Any angle — including negative or greater than 360°.

Unit Circle
0° 90° 180° 270° 225° ref: 45°
(cos θ, sin θ) shown on circle
Learn the concept
The Unit Circle
Master the unit circle — the 16 benchmark angles in degrees and radians, their (cos, sin) coordinate pairs, and why this circle is the foundation of all trig beyond right triangles.
Read lesson →

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