# How can one find the area between the curves

mathelord
when three curves intersect,i mean like the intersection of three straight lines to give a triangle,how can one find the area between the curves

area of a triangle is given by 1/2 * b * h

I think mathelord means any three curves. You can use a double integral. Do you know calculus?

If you don't know calculus you calculate the height. The factor of two perpendicular slopes is -1.

HallsofIvy
$$\int_a^b(f2(x)-f1(x))dx+ \int_b^c(f3(x)-f1(x)dx$$