Question

Find the area of a vertical cross section through the center of the base of a cone with a height of 5

feet and a circumference of about 28.26
feet. Use 3.14
for π
.

Answer 1

Answer: 22.5

Explanation:

The vertical cross-section is basically the triangle in the cone

The triangle's area is base*height/2 (i'm sure you know this).

Hence, the height is 5, so the area is base*2.5

The circumference of the bottom is 28.26.

2*pi*r=28.26, so pi*r=14.13

so r=4.5

Hence, the diameter=9, so the base is 9 for the triangle

So the: 9*2.5 is 22.5