posted by yanet .
the hight of a triangle is four times the length of the base. find the base and height of the triangle if the area is 18 square inches?
let the base be x units long, where x is a positive number
then the height is 4x units long
Area of triangle = 1/2 base x height
18 = 1/2(x)(4x)
9 = x^2
x = 3