1.

A Conical firework is of. base diameter 10 centimetres and height 12 centimetres, 10000 such fireworks are to be wrapped in colour paper. The price of the colour paper is 2 rupees per square metre. What is the total cost?

Answer»

r = 5 cm

h = 12 cm 

t = 13 cm 

Total surface area of one firework = Base area + Curved surface area

= π x 52 + π x 5 x 13 = 25π + 65π

= 90π cm2 = 90 x 3.14

= 282.6 cm2

Surface area of 10000 firework

= 282.6 x 10000 = 2826000 cm2

\(\frac{2826000}{100\times100}=282.6\) m2

Total cost = 282.6 x 2 = Rs 565



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