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baasic geometry

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A rectangle has width the same as side of a square whose perimeter is 20m. the length of the rectangle is 9m. Find the perimeter of this rectangle.
W=L+20m


2L+2W=9
2L+2(w+20m)=9
2L+2w+20=9
4l+20=9
4L=20+9
4L=29
L=29/4

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