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5 + 5 does not equal eleven because If we were to take 5 people and add 5 more people we would have ten people.
5(r+5) is.
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a(r) = 2pi*r^2 and d = 2r 5 = 2r => r = 5/2 a(r) = 2pi*(5/2)^2 a(r) = 2pi*25/4 a(r) = 25pi/2 or, in decimal form, 39.2699 millimetres2
(r + 5)(r + 5)