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The circumference of the base of a cone is 24 - inches. The siant height of the cone is 20 inches.
What is the surface area of the cone? Express the answer in terms of .
240 square inches
384 n square inches
480 square inches
624 + square inches

Respuesta :

Answer: 384Ï€ inches

Step-by-step explanation:

the formula for surface area of a cone = 2Ï€rh

Circumference = 2Ï€r

24Ï€ = 2Ï€r

r = 24Ï€/2Ï€

r = 12

the radius of the base = 12inches

Using pythagoras theorem,

20^2 - 12^2 = 400 - 144 = 256 = 16^2

The height of the cone = 16inches 

Therefore, the surface area of the cone= 2Ï€rh

= 2 × π × 12× 16

=384Ï€ inches

arianariv

Answer:

B) 384

Step-by-step explanation:

I just did it!

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