The dome of a residential tower is in the form of a hemisphere with a radius of 560 cm. Find the cost of painting it at the rate of Rs 25 per m2 (Take π = )
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. Rs. 4928.
Curved urface area of hemisphere = 2πr2
According to the given question,
Radius of hemisphere = 560 cm = 5.6 m
Surface area to be painted = 2 × (22/7) × 5.6 × 5.6
⇒ 2 × 98.56 = 197.12
Now, cost of painting = Curved surface area of hemisphere × Rate of painting per m2
⇒ 197.12 × 25 = 4928