The rectangle below is dilated by a scale factor of one half

Question

2
1
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. Find the perimeter of the dilated rectangle. Figures are not necessarily drawn to scale.
20 18

Answer 1

The original rectangle has a perimeter of 2(20) + 2(18) = 76.

After dilating the rectangle by a scale factor of 1/2, the dimensions become 10 and 9.

So, the perimeter of the dilated rectangle is 2(10) + 2(9) = 38.