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A radian is an arc of a circle whose size is the same as its radius and in degrees it is about 57.3 degrees because there are 360 degrees around a circle and so 2*pi radians = 360 degrees.

2 pi = 360 degrees

therefore 18 degrees = 2 pi x 18/360 radians

= 0.1 pi radians

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9y ago

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