Geometry
posted by Kaley .
One side of a triangle is 15 inches, and the area of the triangle is 90 square inches. What is the area of a similar triangle in which the corresponding side is 9 inches?

Why not use the concept I showed you in
http://www.jiskha.com/display.cgi?id=1274147511
for a similar problem.
let me know what you got for this one. 
i don't understand this

area2/90 = 15^2/9^2
area2/90 = 225/81
area2 = 90(225)/81 = 250