Question
Mathematics Question on Mensuration
An iron pipe 20 cm long has exterior diameter equal to 25 cm. If the thickness of the pipe is 1 cm, then the whole surface of the pipe is
A
3068 cm2
B
3268 cm2
C
3168 cm2
D
3368 cm2
Answer
3168 cm2
Explanation
Solution
The correct option is (C) : 3168 cm2