Posted by Kalem on Tuesday, May 17, 2011 at 4:21pm.
A rectangle measures 6 inches in length by 9 inches in width. If the rectangle will be enlarged by 250%, what will be the lengths of the sides of the new rectangle?
What percent bigger is the perimeter of the new rectangle, compared to the original?

geometry  Reiny, Tuesday, May 17, 2011 at 5:01pm
original area = 54 in^2
new area = 54(2.5) = 135 in^2
Assuming the new rectangle is similar to old one,
length = 9x , width = 6x
54x^2 = 135
x^2 = 2.5
x = √2.5 = 1.58
new length = 9(1.58) = appr. 14.23 in
new width = 6(1.58) = 9.49 in
percentage increase of perimeter = 58%
new perimeter is 158 % of old one
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