SOLUTION: The lengths of the sides of a triangle are 3x, 5x – 12, and x + 20. Find the value of x so that the triangle is isosceles.

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Question 549951: The lengths of the sides of a triangle are 3x, 5x – 12, and x + 20. Find the value of x so that the triangle is isosceles.
Answer by mananth(12270) About Me  (Show Source):
You can put this solution on YOUR website!
Any two side are equal in isoscles triangle

5x-12=x+20
4x=32
x=8
5x-12=28
x+20=28
5x=40
28,28,40