Question

exterior diameter of an iron pipe is 25cm and it is 1 cm thick find the whole surface area

please give right answer ​

Answer 1

Answer:

3318.86 cm²

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

Answer 2

Answer:

Answer:

3318.86 cm²

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

Step-by-step explanation:

Yeas bhn app bhi bhut dun bad dikha sorry late reply