The radius of a hemisphere is 14 cm. What is the cost of painting the outer curved surface of the hemisphere at the rate of ₹45 per cm ?(Take $π =\frac{22}{7}$)
Answer & explanation
Correct answer: option 2
We know that,
Surface area of a hemisphere = 2πr2
We have,
Radius of hemisphere = 14 cm.
So, outer surface area of hemisphere = 2 × \(\frac{22}{7}\) × 142 = 1232 cm2
The cost of painting = 1232 × 45 = ₹55440