Question

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? `(π = 22/7)`

Answer 1

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 xx 6 xx (6 + 8)`

= `22/7 xx 6 xx 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.