50 students of class X and a visit to an orphanage and spend the whole day with its inmates. Each one prepared a spherical flower base using cardboard to gift the inmates. The radius of sphere is 4.2 cm.
(i). What is the amount spent for purchasing the cardboard at the rate of Rs.20 per 100-meter square?
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Answer:
(a)r = 4.2 cm, h = 11.2 cm
S.A. of cylindrical vase = CSA + area of base
= 2 th + xr²
= 2 m x 4.2 x 11.2 + *x (4.2)²
= 4.2 (22.4+ 4.2)
2×2×26 = 4.2 x x 26.6
= 351.12 cm²
SA of 50 cylinder = 50 x 351.12
= 17556 cm²
Total cost 17556 x. 20 100
= Rs. 3511.20
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