The volume of the hemisphere is 23r3
V=2/3×(3.14×1^3 )
=2.09 m^3
Question : Find $\frac{1}{21}$th of the volume of a hemisphere whose radius is 4.2 m.
Option 1: 6.6 m3
Option 2: 7.3 m3
Option 3: 8.2 m3
Option 4: 7.1 m3
Question : The volume of a hemisphere is $486 \pi\ \mathrm{cm}^3$. Find the radius.
Option 1: 7 cm
Option 2: 9 cm
Option 3: 4 cm
Option 4: 8 cm
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