find the surface area of tube whose length is 21 cm,internal radius is 10cm and the thickness of the metal used in 1.5 cm.find the cost of painting it all over at the rate of Rs.16 per cm square.
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Answer:
Rs 24,808
Step-by-step explanation:
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Cost of painting the tube is Rs 24288.
Step-by-step explanation:
We have to find the surface area of a tube to be painted with length = 21 cm
Internal radius of the tube = 10 cm
Thickness of the tube = 1.5 cm
Radius of the outer layer of the tube = 10 + 1.5 = 11.5 cm
Tube is in the shape of a cylinder and we can paint the outer surface of the tube only.
Therefore, surface area of the tube = 2πrh
= 2π(11.5)(21)
= 1518 square cm
Cost of the painting per square feet is Rs 16 per square cm.
Total cost to paint the surface of the tube = 1518×16
= Rs 24288
Therefore, the cost of painting the tube is Rs 24288.
Learn more about the surface area from https://brainly.in/question/2898558
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