Question

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Answer 1

R=3 inches that’s the answer

Answer 2

Answer:

Volume of hemisphere =

$\frac{2}{3} \pi \: r {}^{3}$

Given volume =

$18\pi \: cube$

$\frac{2}{3} \times \frac{22}{7} \: {r}^{3} = 18 \times \frac{22}{7}$

So pi is there on both the sides so it will be cut from both LHS and RHS

$\frac{2}{3} \times r {}^{3} = 18$

$2 \times r {}^{3 } = 18 \times 3$

$2 \times r {}^{3} = 54$

$r {}^{3} = \frac{54}{2}$

$r {}^{3} = 27$

$r = 3$

Therefore value of r=3 inches

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