Posted by Tyler on .
The scale factor for two similar triangles is 4 : 3. The perimeter of the smaller triangle is 12. What is the perimeter of the larger triangle?

Geometry 
Reiny,
since perimiter is a linear measurement, the ratio of the perimeter equals the ratio of the sides
if x is the larger perimeter,
x/12 = 3/4
4x = 36
x = 9