Question

if a hemisphere of radius 21cm is melted and recast to form a cone of height 42cm ,then the radius of cone is
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Answer 1

Answer:

21cm

Step-by-step explanation:

Vol of hemisphere = 2/3(πr^3)

Vol of cone = 1/3(πR^2h)

A.T.Q

Vol. of hemisphere = Vol. of cone

2/3πr^3 = 1/3πR^2h

(2*21*21*21)/42 = R^2

21cm = R