Answer: b1 = (2A-hb2)/h
Step-by-step explanation:A=1/2h(b1+b2)
2A=h(b1+b2)
2A=hb1+hb2
2A-hb2=hb1
(2A-hb2)/h=b1
b1 = (2A-hb2)/h
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