Presumably C means circumference and R means radius?
If C = 2*pi*R
Then R = C divided by 2*pi
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The answer depends on what R and C are.
If: C = 2r Then: r = C/2
p = r - c r - c = p r - c - r = p - r -(-c) = -(p) c = -p
p+c=r.