A= 1/2 (a+b)h
First , multiply each side of the equation by 2:
2A = 2 (1/2) (a+b)h
2A =(a+b) h
Divide each side by (a+b)
2A/(a+b) = (a+b)h / (a+b)
2A/(a+b)= h
h= 2A/(a+b)
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