A sphere of radius 21 cm is cut into 8 identical parts by 3 cuts (1 cut along each axis). What will be the total surface area (in cm2 ) of each part?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2, i.e. 1732.5
TSA of sphere = 4πr2
TSA of sphere when it is divided into 8 identical pieces = 10πr2
Surface area of each part = 10πr2/8 = (10× 22/7 × 21 × 21)/8 = 1732.5 cm2