How to find the perimeter of an acute / obtuse triangle Practice Test

Two similiar triangles have a ratio of perimeters of 7:2.

If the smaller triangle has sides of 3, 7, and 5, what is the perimeter of the larger triangle.

Two similiar triangles exist where the ratio of perimeters is 4:5 for the smaller to the larger triangle. If the larger triangle has sides of 6, 7, and 12 inches, what is the perimeter, in inches, of the smaller triangle?