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A tent consists of a frustum of a cone capped by a cone. If the radii of the ends of the frustum be $ 13 \mathrm{~m} $ and $ 7 \mathrm{~m} $, the height of the frustum be $ 8 \mathrm{~m} $ and the slant height of the conical cap be $ 12 \mathrm{~m} $, find the canvas required for the tent. $ \quad $ (Take: $ \pi=22 / 7) $
Given:
A tent consists of a frustum of a cone capped by a cone.
The radii of the ends of the frustum are \( 13 \mathrm{~m} \) and \( 7 \mathrm{~m} \), the height of the frustum is \( 8 \mathrm{~m} \) and the slant height of the conical cap is \( 12 \mathrm{~m} \).
To do:
We have to find the canvas required for the tent.
Solution:
Radius of the bottom of the tent $r_1 = 13\ m$
Radius of the top of the tent $r_2 = 7\ m$
Height of the frustum part $h_1 = 8\ m$
Slant height of the conical cap $l_2 = 12\ m$
Let $l_1$ be the slant height of the frustum part.
Therefore,
$l_{1}=\sqrt{(h)^{2}+(r_{1}-r_{2})^{2}}$
$=\sqrt{(8)^{2}+(13-7)^{2}}$
$=\sqrt{(8)^{2}+(6)^{2}}$
$=\sqrt{64+36}$
$=\sqrt{100}$
$=10 \mathrm{~m}$
The canvas required for the tent $=$ Surface area of the whole tent
$=\pi(r_{1}+r_{2}) l_{1}+\pi r_{2} l_{2}$
$=\pi[(13+7) \times 10]+\pi(7)(12)$
$=\pi[20 \times 10]+\pi(84)$
$=200 \pi+84 \pi$
$=284 \pi$
$=284 \times \frac{22}{7}$
$=\frac{6248}{7}$
$=892.57 \mathrm{~m}^{2}$
$892.57 \mathrm{~m}^{2}$ of canvas required for the tent.