The perimeter of triangle ABC is 56.4 cm, and the perimeter of triangle GHJ is 14.1 cm. The perimeter of triangle DEF is the geometric mean of these two. [perimeters] what is the perimeter of triangle DEF?
56.4 x 14.1 =795.24 feet-product of the two perimeters.
Sqrt(795.24) =28.2 feet-The perimeter of triangle DEF.
