SOLUTION: what is the perimeter of a room 15 feet to 21 feet?

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Question 897781: what is the perimeter of a room 15 feet to 21 feet?
Answer by MathLover1(20849) About Me  (Show Source):
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the room is in shape of rectangle, and the perimeter of a rectangle is P=2L%2B2W where L is length and W is width
so,the perimeter of a room W=15ft and L=21ft is
P=2L%2B2W
P=2%2A21ft%2B2%2A15ft
P=42ft%2B30ft
P=72ft