SOLUTION: HOW DID PEOPLE GET THE FORMULA A=1/2(B1+B2)H FROM A=BH

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Question 130678: HOW DID PEOPLE GET THE FORMULA A=1/2(B1+B2)H FROM A=BH
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
HOW DID PEOPLE GET THE FORMULA A=1/2(B1+B2)H FROM A=BH
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They didn't.
A=BH is the area of a parallogram.
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A = (1/2)(B1 + B2)H is the area of a trapizoid.
The formula comes from adding the area of the two
triangles formed by the diagonal of a trapizoid.
A = (1/2)B1*H + (1/2)B2*H
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Cheers,
Stan H.