Question 82589
Rule: Whatevery you do to one side you have to do to the other.
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A=1/2h(B+b)
Multiply both sides by 2 to get:
2A = h(B+b)
Divide both sides by h to get:
2A/h = B+b
Subtract B from both sides to get:
b = [2A/h]-B
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Cheers,
Stan H.