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MAT Exam 2020 Paper

Question : 104 of 200

Marks: +1, -0

Solution:

Concept:

A conical tent's canvas area equals its curved surface area,

\pi r l

, where

l

is the slant height.

Explanation:

Given radius

r = 5\ \mathrm{m}

and height

h = 12\ \mathrm{m}

First, find the slant height using

l = \sqrt{r^2 + h^2}

l = \sqrt{5^2 + 12^2} = \sqrt{25 + 144} = \sqrt{169} = 13\ \mathrm{m}

Canvas required

= \pi r l = \pi \times 5 \times 13 = 65\pi\ \mathrm{m}^2

Since

65\pi

is not listed among the options, the correct choice is "None of these".

Answer:

D. None of these

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