Posted by IB student on Wednesday, September 12, 2012 at 4:12pm.
I just need to know how to use the perimeter formula to work this out (dont give answer)
A rectangular certicate 8 in. by 10 in. will have a frame 1 1/2 in. wide surrounding it. What is the perimeter of the outside edge of the frame?

MathPerimeter  Ms. Sue, Wednesday, September 12, 2012 at 4:19pm
P = 2L + 2W
8 + 3 = 11
10 + 3 = 13
The outside of the frame is 11 by 13.

MathPerimeter  DrBob222, Wednesday, September 12, 2012 at 4:31pm
I don't like the way the problem is stated. A 11/2" wide frame can never go around a certificate that is 8 x 10". Ms Sue has interpreted the problem the only way it makes sense. I think the problem should have said that a frame was placed around the certificate with a space of 11/2". (To make it even clearer it could have added, on each side as well as top and bottom of the certificate.)

MathPerimeter  IB student, Wednesday, September 12, 2012 at 7:55pm
Thanks! :)
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