Answers

2014-09-27T19:26:54+08:00
C = 2πr
C  = 2(x-2)π
C =  (2x-4)π cm.

A = πr^2
A = π (x-2)^2
A = π (x^2 - 4x + 4) sq. cm.
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2014-09-27T20:32:36+08:00