Write a linear expression in simplest form to represent the perimeter of the triangle to the right then find the perimeter if the value of x is 10 millimeters

Since there is no image given, the perimeter is the sum of measurement of the sides of the triangle. Assuming that the triangle is equilateral. Then the perimeter of the triangle is equal to

P = x + x + x

P = 3x

P = 30 mm