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Why is the mathematical radian 180 degrees equal to π? Please elaborate, thank you! (3 1 12:2 1:43)
180 degrees is the angle value and π is the radian value.

The central angle of an arc whose arc length is equal to the radius of a circle is 1 radian. According to the definition, the radian of a week is 2πr/r=2π, and the 360-degree angle is 2π radian, so the radian of 1 is about 57.3, that is, 57 17' 44.806'', and 1 is π/ 188.