The cost of painting a conical tent of radius $3.5 m$ and slant height $7 m$ at a rate of $₹ 10 / m^{2}$ is .

₹ 770

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₹ 335

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₹ 1, 005

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₹ 370

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Solution

The correct option is A $₹ 770$
Given that,
radius of cone is $3.5 m$ .
Slant height of cone is $7 m$ .
Rate of painting is $₹ 10 / m^{2}$ .

We know that,
curved surface area of a cone $= π r l$

Now, cost of painting the tent
$= Rate of painting \times Curved surface area of tent$
$= 10 \times \frac{22}{7} \times \frac{35}{10} \times 7$
$= ₹ 770$

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The cost of painting a conical tent of radius 3.5 m and slant height 7 m at a rate of ₹ 10/m2 is .

The correct option is A ₹ 770Given that, radius of cone is 3.5 m. Slant height of cone is 7 m. Rate of painting is ₹ 10/m2. We know that, curved surface area of a cone =πrl Now, cost of painting the tent =Rate of painting×Curved surface area of tent =10×227×3510×7 =₹ 770

The cost of painting a conical tent of radius $3.5 m$ and slant height $7 m$ at a rate of $₹ 10 / m^{2}$ is .