\[a=\frac{1}{2}bh\]
Solving for b. Want to solve for h instead?
1
Simplify  12bh\frac{1}{2}bh  to  bh2\frac{bh}{2}.
a=bh2a=\frac{bh}{2}

2
Multiply both sides by 22.
a×2=bha\times 2=bh

3
Regroup terms.
2a=bh2a=bh

4
Divide both sides by hh.
2ah=b\frac{2a}{h}=b

5
Switch sides.
b=2ahb=\frac{2a}{h}

Done
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