Posted by sha on Wednesday, June 23, 2010 at 8:25pm.
dimension of a floor; the perimeter of a rectangular floor is 90ft. find the dimensions of the floor if the length is twice the width

fintemath  Ms. Sue, Wednesday, June 23, 2010 at 9:08pm
P = 2L + 2W
90 = 4W + 2W
90 = 6W
15 = W
Check:
15 + 15 + 30 + 30 = 90

fintemath  sha, Wednesday, June 23, 2010 at 9:24pm
i know 90 is the perimeter but where did the 4W + 2W come from?

finitemath  Ms. Sue, Wednesday, June 23, 2010 at 9:25pm
This is the formula for a perimeter.
P = 2L + 2W
Your problem states that the length is twice the width. Therefore, L = 2W

fintemath  sha, Wednesday, June 23, 2010 at 9:30pm
what happened to 2L? sorry for my dumb question.

fintemath  sha, Wednesday, June 23, 2010 at 9:34pm
oh nevermind.. i got it. thanks for helping me Ms. Sue (:

fintemath  Ms. Sue, Wednesday, June 23, 2010 at 9:40pm
You're welcome, Sha.
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