Answer:
4x+6
Step-by-step explanation:
We are given that:
An equilateral triangle has a perimeter of 12x + 18 units.
We know that sides of an equilateral triangle are equal
Let each side be equal to x
Then, perimeter=sum of sides
= 3x
Hence, 3x=12x+18
3x=3(4x+6)
i.e. x=4x+6
Hence, expression that can be used to show the length of one side of triangle= 4x+6
