How do I find the area for a trapezoid with no b2?

the question is "Tim's workbench is in the shape of a trapezoid. If the area of Tim's trapezoidal workbench has a total of 1,440 square inches, what is the total length, in inches, of the longest side of his workbench?

 

well the shortest is 32in. and the seconed longest is 40in. but i have to find out how long the *BIGEST* side is in inches!
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3 Answers

you add the top and the bottom number then moutply hte base then divide by 2
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im having the same problem anyone can help us out
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1278
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