Question 9
Mensuration of SolidsA solid cylinder of radius 3cm has a total surface area of 36πcm2. Find its height
- A.2cm
- B.3cm
- C.4cm
- D.5cm
- E.6cm.
Show the answer and explanation
Answer: B (3cm)
Explanation
Total surface area = 2πr² + 2πrh = 18π + 6πh = 36π, so 6πh = 18π and h = 3cm.