A cone shaped firework is of base-diametre 10 centimetres and height 12 centimetres. 10000 such firework are to be wrapped in colour paper. The price of paper is 2 rupees per square metre. What is the total cost of wrapping?

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Solution

Base-diametre of the cone = 10 cm

∴ Base-radius of the cone = = 5 cm

Height of the cone = 12 cm

We know that the slant height of the cone = .

Curved surface area of one conical firework = πrl

Curved surface area of 10000 fireworks =

Price of paper required for 1 square metre = Rs.2

∴ Total cost of wrapping = Rs.2 × 204.1 = Rs.408.20

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