MathPerimeter
posted by IB student .
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?

P = 2L + 2W
8 + 3 = 11
10 + 3 = 13
The outside of the frame is 11 by 13. 
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.)

Thanks! :)

A 167
p23
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