The exterior diameter of iron pipe is 25 cm. It is 1 cm thick. Find the whole surface area of the pipe if it is 21 cm long.
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3318.86 cm² is the whole surface area of the pipe The exterior diameter of iron pipe is 25 cm. It is 1 cm thick. and 21 cm long
Step-by-step explanation:
Exterior diameter = 25 cm
Thickness = 1 cm
Interior diameter = 25 - 2 = 23 cm
R = 25/2 cm
r = 23/2 cm
h = 21 cm
Outer surface area = 2π Rh = 2 (22/7) (25/2) * 21 = 1650 cm²
inner surface area = 2π rh = 2 (22/7) (23/2) * 21 = 1518 cm²
Surface area on both ends = 2 * π(R² - r²) = 2π(R + r)(R - r)
= 2(22/7)(24)(1)
= 150.86 cm²
Total Surface area of pipe = 1650 + 1518 + 150.86 = 3318.86 cm²
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