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DaJackal · Answer 1 · 2018-02-25T21:54:08+0000

A= 0.5(b₁ + b₂).h, or
A =0.5.h(b₁ + b₂): divide both sides by 0.5 x h

A/(0.5 x h) = b₁ +b₂, subtract b₂ from both sides:

A/(0.5 x h) - b₂ =b₁ OR ↔(A - 0.5 x h x b₂)/0.5 x h =b₁
BOTH ARE VALID

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