Answer :

[tex]A=\frac{1}{2}*bh \\ \\ bh=\frac{A}{\frac{1}{2}}=\frac{A}{1}*\frac{2}{1}=2A \\ \\ bh=2A \\ \\ \boxed{b=\frac{2A}{h}}[/tex]
A=(b*h)/2

b*h=2A

b=(2A)/h

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