# How can one find the area between the curves

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

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

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

Werg22
If you don't know calculus you calculate the height. The factor of two perpendicular slopes is -1.

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