posted by Colin .
The area A of a triangle is given by the formula A=1/2bh If the base of the triangle with height 12 inches is doubled, its area will be increased by 48 square inches. Find the base of the orignial triangle.
Doubling the base without changing the height would simply double the area.
So the increase is 48 square inches, which means the original triangle is 48 square inches.
48 = (1/2)base(12)
base = 8