triangle Area = .5 * (base * height) 36 = (base * height) / 2 So let's say base = 9 height 8 If base and height are scaled by a factor if 5 than base = 45 height 40 and area = .5 * (45 * 40) area = 900
Basically, the area increases by a factor of 25. The base increases by 5 and the height increases by 5 so the area increases by 5*5 = 25
