Question : A conical tent with a radius of 6 units and a height of 8 units is to be made with canvas. How much canvas is needed to make the tent? (Rounded off to two places of decimals)
Option 1: 188.57 units
Option 2: 155.87 units
Option 3: 166.57 units
Option 4: 177.55 units
Correct Answer: 188.57 units
Solution :
Radius, $r$ = 6 units
Height, $h$ = 8 units
Let the slant height be $l$.
So, $l^2= {r^2+h^2}= \sqrt{6^2+8^2}= \sqrt{100}= 10$ units
Area of the canvas = Curved surface area of cone
= $ \pi r l$
= $\frac{22}{7}×6×10$
= $188.57$ units
Hence, the correct answer is 188.57 units.
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