Glencoe Math: Course 3, Volume 2
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Glencoe Math: Course 3, Volume 2 View details
5. Surface Area of Cones
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Exercise 23 Page 637

Use the formula for the surface area of a cone.

Practice makes perfect

The given solid is a cone.

To calculate the surface area of a cone, we can use the known formula where is the radius of the base and is the slant height of the cone.
Looking at the diagram, we know that the radius of the cone's base is yards and that the slant height of the cone equals yards. By substituting with and with into the formula, we can calculate
Evaluate right-hand side
The surface area of the cone is approximately square yards.