To convert degrees to radians, divide the number of degrees by 180, and multiply the result by pi.
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It is pi/4 radians.
The arc_length is given by the angle measured in radians times the radius of the arc. To convert degrees to radians divide by 180° and multiply by π radians. eg 45° = 45° ÷ 180° × π radians = π/4 radians. eg 60° = 60° ÷ 180° × π radians = π/3 radians.
15
Amplitude = 5 Period = pi/4 radians (= 45 degrees).
tan(1) = 1.5574 where the angle is measured in radians.