The focal length of a concave mirror is about equal to half of its radius of curvature.
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The Center of curvature is 2 times the focal length. By the way this is a physics question.
R = 2f
arc length/2pi*r=measure of central angle/360
The relation between the arc of length and the central angle is that the arc of length divided by one of the sides is the central angle in radians. If the arc is a full circle, then the central angle is 2pi radians or 360 degrees.
yes