An equilateral triangular tent has sides that measure x-10 units. Its perimeter is 63 units.

What is the value of x?

Enter your answer in the box.

x = ?

An equilateral triangle's sides are all equal. So you can set up the following equation and solve.

3 (x-10) = 63

x-10=21

x=31

An equilateral triangle has 3 equal sides. The perimeter would equal all of those sides added together. So divide 63 by 3

63/3=21

21 is equal to one side. One side is equal to x-10. So set them equal to each other

21=x-10

solve

x=31