Find the curved surface area and total surface area, respectively, of a cylinder of radius of base 28 m and height 40 m.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e 7040 m2 and 11,968 m2.
CSA = 2 × 22/7 × 28 × 40
CSA = 2 × 22/7 × 1120 ≈ 7040 m²
Total Surface Area = 7040 + 2 × 22/7 × 28²
Total Surface Area = 7040 + 2 × 22/7 × 784
Total Surface Area = 7040 + 2 × 17248/7
Total Surface Area = 7040 + 4928 ≈ 11968 m²