A brass hemispherical bowl has an inner diameter of 14 cm. Find the cost of painting its inner surface at the rate of ₹20 per cm².
Show answer & explanation
Correct answer: C
Explanation
diameter = 14 cm ⇒ r = 7 cm
Rate = ₹20 per cm²
According to the formula:
Internal area of hemisphere = 2πr²
Area = 2 × 22/7 × 7²= 308 cm²
Cost = 308 × 20 = ₹6160