Search SchoolNGR

Thursday, 14 May 2026
Register . Login

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

The total surface area of a hemispher is 75\(\pi cm^2\). Find the radius.
Take Free Practice Test On 2026 JAMB UTME, Post UTME, WAEC SSCE, GCE, NECO SSCE
  • A 5.0 cm
  • B 7.0 cm
  • C 8.5 cm
  • D 12.0 cm
Correct Answer: Option A
Explanation:
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

Share question on: