SOLUTION: In an isosceles triangle, the lenght of one of the equal sides is 2.5 times the lenght of the third side. The perimeter is 10.8. Find the lenght of each side.

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Question 1019802: In an isosceles triangle, the lenght of one of the equal sides is 2.5 times the lenght of the third side. The perimeter is 10.8. Find the lenght of each side.
Answer by josgarithmetic(39613) About Me  (Show Source):
You can put this solution on YOUR website!
b, the third side or base side;
x, either congruent side of the isosceles triangle;
x=2.5b

2x%2Bb=10.8

2%282.5%29b%2Bb=10.8

6b=10.8

b=10.8%2F6
b=5.4%2F3
highlight%28b=1.8%29