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?

- Math-Perimeter -
**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.

- Math-Perimeter -
**DrBob222**, Wednesday, September 12, 2012 at 4:31pm
I don't like the way the problem is stated. A 1-1/2" 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 1-1/2". (To make it even clearer it could have added, on each side as well as top and bottom of the certificate.)

- Math-Perimeter -
**IB student**, Wednesday, September 12, 2012 at 7:55pm
Thanks! :)

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