Radians and Arc length interactive graph

Radians are an alternative way of measuring angles. Drag the point D around circle, you could get the change result of Arc length and angle in radians (with radius 6).

Formula: angle = arclength/radius. Now 1.5 radians will be about 90° and 3 radians will be about 180°. 1 radian is approximately 57.3°.

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