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Glencoe Math: Course 3, Volume 2 View details

5. Surface Area of Cones

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Exercise 25 Page 637

Use the formula for the surface area of a cone.

354.1 ft^2

Practice makes perfect

The given solid is a cone with a radius of 5.1 feet and a slant height of 17 feet. To calculate the surface area of a cone, we can use the known formula where r is the radius of the base and l is the slant height of the cone. S=π rl+π r^2 We can now substitute 5.1 for r and 17 for l into the formula to calculate the value of S.

S=π rl+π r^2

SubstituteII

r= 5.1, l= 17

S=π( 5.1)( 17)+π( 5.1)^2

▼

Evaluate right-hand side

CalcPow

Calculate power

S=π(5.1)(17)+π(26.01)

Multiply

S=86.7π+26.01π

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