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# What Will Be the Cost of Making a Closed Cone of Tin Sheet Having Radius of Base 6 M and Slant Height 8 M If the Rate of Making is Rs.10 per Sq.M ? - Geometry

Sum

What will be the cost of making a closed cone of tin sheet having radius of base 6 m and slant height 8 m if the rate of making is
Rs.10 per sq.m ?

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#### Solution

Radius of the base of cone, r = 6 m
Slant height of the cone, l = 8 m
∴ Total surface area of the cone = πr(r + l) = 22/7 x 6 x ( 6 + 8 ) = 22/7 x 6 x 14 = 264 m2

Rate of making the cone of tin sheet = Rs 10/m2
∴ Total cost of making the cone of tin sheet
= Total surface area of the cone × Rate of making the cone of tin sheet
= 264 × 10
= Rs 2640

Thus, the cost of making the cone of tin sheet is Rs 2640.

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#### APPEARS IN

Balbharati Mathematics 2 Geometry 9th Standard Maharashtra State Board
Chapter 9 Surface Area and Volume
Practice Set 9.2 | Q 4 | Page 119
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