Answer :

[tex]A_\Delta=\frac{bh}{2}\\\\\frac{bh}{2}=A_\Delta\ \ \ \ |multiply\ both\ sides\ by\ 2\\\\bh=2A_\Delta\ \ \ \ \ |divide\ both\ side\ by\ b\\\\\boxed{h=\frac{2A_\Delta}{b}}[/tex]

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