Question

An equilateral triangle has an angle measure of 2x what is the value of x and all three of the side lengths

Answer 1

you cannot know the length of the sides
but you do know that since the sum of the angles is \(180\) degrees, then
\[2x+2x+2x=180\] or \(6x=180\) so you can solve for \(x\), but not for the length of the sides

Answer 2

each angle of equilateral trianle =60
2x=60
x=30