A solid cylinder has radius of base 14 cm and height 15 cm. 4 identical cylinders are cut from each base as shown in the given figure. Height of small cylinder is 5 cm. What is the total surface area (in cm²) of the remaining part ?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 ie 3432.
Remaining T.S.A = T.S.A(initial) + 8 × C.S.A (small cylinder)
= 2πr(r + h) + 8 × 2πr’h
= 2π × 14 × 29 + 8 × 2π (7/2) × 5
= 2π(14 × 29 + 20 × 7)
= 2π (546)
= 3432