The circumference of a circle can be found using the formula C = 2r. Which is an equivalent equation solved for r?

r = C
r = C(2)
r = r equals StartFraction C Over 2 pi EndFraction.
r = r equals StartFraction 2 pi Over C EndFraction.

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You need to do x2-x1,y2-y1 and divide it by 2 and you should get (1,-3)