Question:Volume of a hemisphere is `19404 cu`. cm. Its radius is : 

A `10.5 cm` 
B `21 cm` 
C `17.5 cm` 
D `42 cm` 

+ Answer
B 

+ Explanation
`2/3 xx 22/7 xx R^3`

`= 19404 ⇒ R^3`

`= (19404 xx 21/44)`

`= (21)^3`

`or = 21 cm.`

+ Report

Irin Moni

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