CPM Homework Help : PC Problem 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 ✎

Step 1:

Find r first in terms of x using proportions.

Equation

$\frac{10}{4}=\frac{x}{r}\text{ Solve for } r\text{ in terms of }x.$

Step 2:

Area = π r²
Substitute your result for r into the area formula.