SOLUTION: Find the area of a trapezoid if its height is 3 cm. and the lengths of its bases are 5 cm. and 7cm. The formula of finding the area A of a trapezoid is A=1/2h(b1+b2)

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Question 11402: Find the area of a trapezoid if its height is 3 cm. and the lengths of its bases are 5 cm. and 7cm. The formula of finding the area A of a trapezoid is
A=1/2h(b1+b2)
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
You have the correct formula for the area of a trapezoid. So now all you need to do is to plug the given values into the appropriate places in the formula and do the math.
A+=+%281%2F2%29h%28b1%2Bb2%29
A+=+%281%2F2%29%283%29%285%2B7%29 Simplify.
A+=+%281%2F2%29%283%29%2811%29
A+=+%281%2F2%29%2833%29
A+=+16.5 square centimeters.