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b = 9
h = 8

Solving the equation:
(9*8)/2 = 72/2 = 36

All you have to do is to replace the value of the numbers into the letters.
The letter b is equal to 9.
The letter h is equal to 8.
Where b means base and h means height.
You can realize that (b*h)/2 is the triangle area formula.