Surface Area of a Cone

Presentation

•

Mathematics

•

7th - 9th Grade

•

Hard

Joseph Anderson

FREE Resource

5 Slides • 4 Questions

Surface Area of Cones and Spheres

Surface Area of Cones

Find the area of the circle on the bottom of the cone using
$\pi r^2$
Find the area of the side of the cone using $\pi rl$ where r is the radius and l is the slant height of the cone.

Example 1

Area of the circle.. $\pi r^2$ so (3.14)(6)(6)

\pi rl

so (3.14)(6)(10)=

301.44

inches^2

Multiple Choice

Find the surface area of the following cone.

113.04 cm squared

75.36 cm squared

128.74 cm squared

Multiple Choice

Find the surface area of the following cone.

157.2 yards squared

163.2 yards squared

252.58 yards squared

365.68 yards squared

Surface Area of Spheres

To find the area of any sphere you just need to know the radius. The formula is:
$4\pi r^2$

Example 1

Formula.. $4\pi r^2$ so (4) (3.14)(22)(22)=

6,079.04

cm^2

Multiple Choice

Find the surface area of the following sphere.

452.16 mm²

108.8 mm²

904.32 mm²

6658.56 mm²

Multiple Choice

Find the surface area of the following cone.

314.16 in²

166.67 in²

314 in²

521.24 in²

Surface Area of Cones and Spheres

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