850=1/2 ✖ (a+64) ✖ 17
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180=1/2*(a+17)*17
180=17/2(a+17)
180=17a/2+289/2
180=17a+289/2
180*2=17a+289
360=17a+289
360-289=17a
71/17=a
4.17=a
180=17/2(a+17)
180=17a/2+289/2
180=17a+289/2
180*2=17a+289
360=17a+289
360-289=17a
71/17=a
4.17=a
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