The cross-sectional area is the area of its circle, and you can calculate it from the circle's radius. Multiply the circle's radius by 2 to calculate its diameter.
0
Hishaam M answered this
A pipe is in the shape of a hollow cylinder
Inner C.S.A = 2πrh
Outer C.S.A = 2πRh
where, r is the radius of inner cylinder & R is the radius of outer cylinder