Find the cost of painting a ball that is in the shape of a sphere with a radius of 14 cm. The painting cost of the ball is ₹5 per square centimetre (take ).
Show answer & explanation
Correct answer: A
Explanation
The correct answer is Option 1 i.e. ₹12,320.
We know that,
Surface area of the sphere(SA) = 4πr2
here, r = radius
⇒ SA = 4 × 22/7 × 14 × 14
⇒ SA = 4 × 22 × 2 × 14
⇒ SA = 8 × 22 × 14
⇒ SA = 2464 cm2
The cost of painting is ₹5 per square
Total cost = 2464 × 5
Total cost = ₹12320
Thus, The cost of painting the ball is ₹12320