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rahul dalal

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· 1 Months ago

kon saala en questions ne 2 khante me pra kar dega . es question me na to multiply puri interger digit me ave ha fer us ka under root or karna ha .pura mains ke paper me thare jise 10 question bhi na ave.............

Question:
A machine is in the shape of a right circular cylinder with a hemisphere on one end and a cone on the other. The height of the cylindrical part is 3 times the radius. The radius of cylindrical part, hemisphere and conical part is equal and the ratio of height and radii is 4 : 3 in cone. If surface area of the Machine is 2175 cm2, then find the radius.
Options:
A) 8.5 cm.
B) 16 cm 
C) 14 cm 
D) 17 cm
Solution:

Ans: (a)


r2 = \(\cfrac{2175\times3}{29\pi}\)

= \(\cfrac{2175 \times3}{29\times22}\times7\)

= 72

r = 8.5 cm.

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