a rectangle has a perimter of 146 if the width of the rectangle is 20 how long is it
A rectangle has 4 sides. The 2 sides that are the width are equal. The two sides that are the length are equal. So, if the width is 20, we need to multiply that by 2 (because of the two sides).
20 x 2 = 40
Now we have to find the remainder of the perimeter.
146 - 40 = 106
Remember that this is between 2 sides. We need to divide this by 2 in order to get the length of 1 side.
106 / 2 = 53
The length of the rectangle is 53
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