A Hollow piece of cylindrical pipe has an outside radius of 1.9 inches and an inside radius of 1.8 inches. The pipe is 4 feet long. How many square inches are in the total surface area of the pipe?

I don't quite understand the part " outside radius of 1.9 inches and an inside radius of 1.8 inches." how would it look like? Can someone verify it, please?

Question

A Hollow piece of cylindrical pipe has an outside radius of 1.9 inches and an inside radius of 1.8 inches. The pipe is 4 feet long. How many square inches are in the total surface area of the pipe?

I don't quite understand the part " outside radius of 1.9 inches and an inside radius of 1.8 inches." how would it look like? Can someone verify it, please?

angela210793 · Answer

is it smth like this? use r1=1.9 and r2=1.8|dw:1331407520375:dw|