SOLUTION: the length of a rectangle is three times its width. If the area of the rectangle is 75 cm to the second power , find its perimeter.

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Question 421285: the length of a rectangle is three times its width.
If the area of the rectangle is 75 cm to the second power , find its perimeter.

Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
+A+=+w%2A3w
75+=+3w%5E2
25+=+w%5E2+
+5+=+w
+l+=+3w
l+=+15
The formula for perimeter is
P+=+2w+%2B+2l
+P+=+2%2A5+%2B+2%2A15+
+P+=+10+%2B+30+
+P+=+40+ cm