Solve the formula for the indicated variable. A=1/2bh, for h

We want to have the variable h on one side of the equation and everything else on another side. A good place to start is to divide both sides by 1/2. That way we get rid of that nasty fraction.

A / 1/2 = 1/2bh / 1/2

Now on the left the 1/2 cancels out.

A / 1/2 = bh

And when a number is divided a fraction it's the same multiplying it inverted.

Now it is A (2/1) = bh

Now for the final step, divide both sides by b.

A (2) / b = bh/b

On the left b cancels out and we are left with the final product.

A (2) / b = h or h = A (2) / b