Question 23
Mensuration of SolidsCalculate the surface area of a hollow cylinder which is closed at one end, if the base radius is 3.5cm and the height 8cm. (Take π = 22/7)
- A.126.5cm2
- B.165cm2
- C.176cm2
- D.214.5cm2
- E.253.5cm2
Show the answer and explanation
Answer: D (214.5cm2)
Explanation
Curved surface 2πrh = 2 × 22/7 × 3.5 × 8 = 176 cm², plus one end πr2 = 22/7 × 3.52 = 38.5 cm². Total = 214.5 cm².