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The volume of a hemispherical bowl is \(718\frac{2}{3}\). Find its radius .

Mathematics
JAMB 2007

The volume of a hemispherical bowl is \(718\frac{2}{3}\). Find its radius .

  • A. 4.0 cm
  • B. 5.6 cm
  • C. 7.0 cm
  • D. 3.8 cm
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Correct Answer: Option C
Explanation

Volume of bowl \(\frac{2}{3}\pi r^3\\
718\frac{2}{3}=\frac{2}{3}\pi r^3\\
\frac{2156}{3}=\frac{2}{3} \times \frac{22}{7} \times r^3
∴r^3 = \frac{2156 \times 3 \times 7}{3 \times 2 \times 22}\\
r^3 = 343\\
r = \sqrt[3]{343}\\
r= 7.0cm\)

There is an explanation video available below.


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Explanation Video

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