“How many radians are in 180 degrees?”

180 degrees is the angle of half a circle.

360 degrees is the angle of a full circle.

In radians, a full circle is 2π.

So half of that is a half circle and half of 2π is π.

If 180 degrees is the angle for a half circle and π is the angle for half a circle then both are measures of the same angle.

180 degrees in radians
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