(a+b)(a+b)/2=1/2ab+1/2ab+1/2c²
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(a+b)(a+b)/2=1/2ab+1/2ab+1/2c²
(a+b)(a+b)/2=1/2ab+1/2ab+1/2c²
(a+b)(a+b)/2=1/2ab+1/2ab+1/2c²
(a+b)(a+b)/2=1/2ab+1/2ab+1/2c²
(a+b)(a+b)/2=1/2ab+1/2ab+1/2c²
(a+b)(a+b)/2=1/2ab+1/2ab+1/2c²