Anand wanted to make a cylindrical kaleidoscope of length 30 cm and radius 7 cm. If he is using handmade sheets to make it, then how much sheet will be required for this?
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 1320cm2.
CSA = 2 × pi × r × h
= 2 × 22/7 × 7 × 30
= 2 × 22 × 30
= 1320 cm²