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Example Questions
Example Question #1 : How To Find The Perimeter Of A Rectangle
Robert is designing a rectangular garden. He wants the area of the garden to be 9 square meters. If the length of the lot is going to be three meters less than twice the width, what will the perimeter of the lot be in meters?
3
12
6
1.5
10
12
Let l be the length of the garden and w be the width.
By the specifications of the problem, l = 2w-3.
Plug this in for length in the area formula:
A = l x w = (2w - 3) x w = 9
Solve for the width:
2w²- 3w - 9 =0
(2w + 3)(w - 3) = 0
w is either 3 or -3/2, but we can't have a negative width, so w = 3.
If w = 3, then length = 2(3) - 3 = 3.
Now plug the width and length into the formula for perimeter:
P = 2 l + 2w = 2(3) + 2(3) = 12
Example Question #1 : How To Find The Perimeter Of A Rectangle
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Example Question #21 : Quadrilaterals
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Example Question #22 : Quadrilaterals
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Example Question #23 : Quadrilaterals
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Example Question #24 : Quadrilaterals
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Example Question #25 : Quadrilaterals
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Example Question #26 : Quadrilaterals
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Example Question #27 : Quadrilaterals
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Example Question #28 : Quadrilaterals
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