Cambridge Encyclopedia » Cambridge Encyclopedia Vol. 5

angle - Units of measure for angles, Conventions on measurement, Types of angles, Some facts, A formal definition

A geometrical figure formed by two straight lines meeting at a point. Angles are measured in revolutions (especially per minute [rpm] or per second [rps] when measuring angular velocity), in right angles, degrees (°), radians (rad), or grad. 1 revolution = 4 right angles = 360° = 2? rad = 400 grad.

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