The total surface area of a hemispher is 75\(\pi cm^2\). Find the radius.

  • A 5.0 cm
  • B 7.0 cm
  • C 8.5 cm
  • D 12.0 cm
waec 2018mathematics

The correct answer is A. 5.0 cm

Total surface area of hemisphere is

3\(\pi r^2\) = 75\(\pi cm^2\)

\(r^2\) = \(\frac{75 \pi}{3 \pi}\)

\(r^2\) = 25

r = \(\sqrt{25}\)

r = 5cm

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