2 Answers

Shaft · Answer 1 · 2019-04-18T05:52:42+0000

Answer:

The correct option is C.

Explanation:

From the given figure it is clear that the radius of the cone is 3 units and slant height of the cone is 12 units.

The surface area of the right cone is

$Area=\pi rl+\pi r^2$

Where, r is radius, l is slant height.

Substitute r=3 and l=12 in the above formula.

$Area=\pi (3)(12)+\pi (3)^2$

$Area=36\pi+9\pi$

$Area=(36+9)\pi$

$Area=45\pi$

The surface area of the given right cone is 45π units².

Therefore the correct option is C.

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