### Home > PC > Chapter 4 > Lesson 4.2.3 > Problem 4-101

4-101.

A cone has a height of 10 inches and a radius of 4 inches. If a plane cuts the cone *x* inches below the cone's peak, what is the area of the circular cross section? Homework Help ✎

Find *r* first in terms of *x* using proportions.

Area = π *r*^{2}

Substitute your result for *r* into the area formula.