Final answer:
The correct answer is D) 2π.
Step-by-step explanation:
The difference between the outside and inner surface area of a cylindrical pipe can be determined by calculating the corresponding areas and subtracting them. The surface area of a cylinder (not including the ends) is given by the formula 2πrh, where r is the radius and h is the height.
For a hollow cylinder (pipe), you will have two radii, r1 for the inside radius and r2 for the outside radius. Therefore, the external surface area is 2πr2h, and the internal surface area is 2πr1h. The difference between them is 2π(r2 - r1)h.
If the thickness of the pipe is uniform and equals the difference r2 - r1, we would need to know specific values to calculate the exact difference in areas. However, the options given are A) 7 B) 14 C) π D) 2π. Out of these, 2π is the only one that resembles the 'difference in areas' formula for any non-zero length (h).