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(1/2)*(2*r+4)-((1/4)*(16-(8*r))) = 0
(1/2)*(2*r+4)+(-1/4)*(16-8*r) = 0
1/2*(2*r+4)-1/4*(16-8*r) = 0
1/2*(2*r+4)-1/4*(16-8*r) = 0
3*r-2 = 0
3*r-2 = 0
3*r-2 = 0 // + 2
3*r = 2 // : 3
r = 2/3
r = 2/3
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