The scale factor for two similar triangles is .

The perimeter of the smaller triangle is .

A scale factor can be ratio of area, perimeter or the radius of the triangle.

Ratio of perimeter of smaller triangle to the larger triangle is .

Find the perimeter of the larger triangle in centimeters.

                    (Original equation)

                  (Cross multiply)

                    (Multiply)

                (Divide each side by )

      (Cancel common terms)

Therefore, the perimeter of the larger triangle is .

The perimeter of the larger triangle is .