A storage tank consists of a circular cylinder with a hemisphere adjoined on either end. If the external diameter of the cylinder be 1.4 m and its length be 8 m, find the cost of painting it on the outside at the rate of Rs. 10 per m².
Answers
Given : External diameter of the cylinder = 1.4 m
length of the cylinder, h = 8 m
Radius of the cylinder and hemisphere r , r = 1.4/2 = 0.7 m
Total curved surface area of a storage tank = Curved surface area of a cylinder + Curved surface area of hemisphere
= 2πrh + 2πr²
= 2πr(h + r)
= 2 × 22/7 × 0.7 (8 + 0.7)
= 44 × 0.1(8.7)
= 4.4 × 8.7
= 38.28 m²
Cost of painting it on the outside at the rate of ₹ 10 per m² = 38.28 × 10
= ₹ 382.80
Hence, the cost of painting it on the outside is ₹ 382.80.
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Answer:
Step-by-step explanation:
= 2πrh + 2πr²
= 2πr(h + r)
= 2 × 22/7 × 0.7 (8 + 0.7)
= 44 × 0.1(8.7)
= 4.4 × 8.7
= 38.28 m²
Cost of painting it on the outside at the rate of ₹ 10 per m² = 38.28 × 10
= ₹ 382.80