# ICSE Class 10 Answered

**combination**

Asked by | 31 Dec, 2012, 11:47: AM

Expert Answer

1)

Since, hollow cylinder is melted and casted to a cone, their volumes will be the same.

Therefore,

pi* (R

^{2}- r^{2})h = 1/3 * pi* R^{2}H(3.5

^{2}- 3^{2})21 = 1/3 * R^{2}7R

^{2}= 9(3.5+3)(3.5-3) = 9(6.5)(0.5)R = 5.4 cm

2)

Answered by | 03 Jan, 2013, 02:47: PM

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