Question 33
Mensuration of SolidsA cylindrical pipe 50 m long with radius 7 m has one end open. What is the total surface area of the pipe?
- A.700π m2
- B.98π m2
- C.350π m2
- D.749π m2
Show the answer and explanation
Answer: D (749π m2)
Explanation
Curved surface = 2πrh = 2π × 7 × 50 = 700π. One closed end adds πr2 = 49π. Total = 749π m2.