1 Answer

Wishmaster · Answer 1 · 2023-09-07T20:41:25+0000

Given:

Radius of cone, r=5mm.

Slant height of the cone, l=18mm.

The Surface area of cone formula is,

$A=\pi rl$

Therefore, the surface area of the given cone is,

$\begin{gathered} A=\pi*5*18 \\ =90\pi \end{gathered}$

Therefore, the surface area of the given cone is,

$90\pi$

Hence, the lateral surface area of the cone ,

$90\pi$

The total surface area of the cone formula is,

$A=\pi r(l+r)$

Therefore,

$\begin{gathered} A=\pi(5)(5+18)_{} \\ =\pi*5*23 \\ =115\pi \end{gathered}$

Therefore, the correct option is D.

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