Answer :

[tex]\frac{1}{2}h(b_1+b_2)=a\ \ \ \ \ \ |multiply\ both\ sides\ by\ 2\\\\h(b_1+b_2)=2a\ \ \ \ \ \ \ |divide\ both\ sides\ by\ (b_1+b_2)\\\\\boxed{h=\frac{2a}{b_1+b_2}}[/tex]Answer here

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