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Question

What is the perimeter of the trapezoid above?

498389_59afe04f558146adb9570147e94d20ea.jpg

A
52
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B
72
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C
75
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D
80
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E
87
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Solution

The correct option is B 80
In given figure, AB=20,BC=15 and AD=17
Draw perpendicular from point A to line CD meet at point E
Then BC=AE=15
So in AED,
DE= (17)2(15)2=289225=64=8
Then DC=DE+CE=8+20=28 .......( AB=CE=20)
Then perimeter of trapezoid =20+17+15+28=80

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