Posted by **Kylie** on Sunday, July 24, 2011 at 10:03pm.

the perimeter of an isosceles triangle is 21 meters. the length of one side is 3 meters longer than the length of the other two sides. find the length of each side.

- math -
**Reiny**, Sunday, July 24, 2011 at 11:27pm
sides : x, x , 21-2x

"the length of one side is 3 meters longer than the length of the other two sides"

This is ambiguous

1st interpretation:

----> 21-2x = x+x+3

-4x = -18

x = 4.5

sides are 4.5, 4.5, and 12

This is not a possible triangle.

To have a triangle the longest side must be less than the sum of the other two sides,

2nd interpretation:

---> 21-2x = x+3

-3x = -18

x = 6

sides are 6, 6, and 9

This one works.

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