Posted by **cody gilliam** on Thursday, March 31, 2011 at 5:37pm.

One of a pentagon's sides is 3 feet longer than the other. If the perimeter of the pentagon is 128m, how long is the longest side?

- math 8th grade -
**Reiny**, Thursday, March 31, 2011 at 5:46pm
Your opening sentence is not clear.

Are you saying that 4 of the sides are equal and one is 3 feet longer?

If that is the case, let each of the equal sides be x

then the longer side is x+3, and

x + x + x + x + x+3 = 128

5x+3=128

5x=125

x=15

longer side is 18, the others are 15

- math 8th grade -
**sam**, Thursday, March 31, 2011 at 5:46pm
25+25+25+25+25+28=128

- math 8th grade -
**sam**, Thursday, March 31, 2011 at 5:47pm
minus one of those 25

- math 8th grade -
**sam**, Thursday, March 31, 2011 at 5:48pm
Reiny did it right except i x=25 not 15

- Thanks Sam -
**Reiny**, Thursday, March 31, 2011 at 5:50pm
of course 125/5 = 25 , silly of me

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