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A rectangle is to be inscribed in a right triangle having sides of length 66in, 88in, and 110in. Find the dimensions of the rectangle with greatest area assuming the rectangle i…
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A rectangle is to be inscribed in a right triangle having sides of length 66in, 88in, and 110in. Find the dimensions of the rectangle with greatest area assuming the rectangle i…
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Jan 11, 2017
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A rectangle is to be inscribed in a right triangle having sides of length 66in, 88in, and 110in. Find the dimensions of the rectangle with greatest area assuming the rectangle is positioned as in the accompanying figure.
Mathematics
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Sivano
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This one is hard to explain in print. Let x be the side of the rectangle on the hypotenuse and y be the other side. There is a triangle formed at the right angle of the original which is similar to the original.
So x is to 10 as z is to 8: x/10 = z/8
and z = 4/5 x
The upper part of that leg would be 8 - 4/5 x
The triangle at the top is also similar:
So y is to 6 as (8 - 4/5 x) is to 10: y/6 = (8-4/5 x)/10
and y = 3/5 (8- 4/5 x) = 24/5 - 12/25 x
Now area = xy
Deriv = 0 and solve
Inthu
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Jan 18, 2017
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