A solid has a height of 63 cm and a base radius of 16 cm . If the painting rate is ₹1.75/cm2 , What will be the total cost (in ₹) of painting the total surface area of the cone ? ( use π = 22/7 )
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 7128.
r = 16 cm, h = 63 cm → l = √(16² + 63²) = √4225 = 65 cm
TSA = πr(l + r) = (22/7) × 16 × (65 + 16) = (22/7) × 16 × 81 = 4073.14 cm²
Cost = 4073.14 × 1.75 = ₹7128