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The cross section of a steel pipe is circular, the radius of inner circle is 5cm, the radius of outer circle is 8cm. What is the cross section area of steel pipe in square centimeter
Because the cross section of the steel pipe is circular, the radius of the inner circle is 5cm, and the radius of the outer circle is 8cm, the cross section area of the steel pipe is Π * 82 - Π * 52 = 64 Π - 25 Π = 39 Π = 39 * 3.14 = 122.46 (square centimeter)
The cross section of a steel pipe is annular, the radius of the inner circle is 5cm, the diameter of the outer circle is 8cm, what is the cross-sectional area of the steel pipe?
The diameter of the outer circle is 8cm, not the radius!
The diameter of the outer circle is 8cm, the radius of the outer circle is 4cm, but the radius of the inner circle is 5cm. It's impossible that the inner circle is bigger than the outer circle, right? So it should be changed
5x5x3.14-4x4x3.14 = 28.26 square centimeter
The cross-sectional area of steel pipe is 28.26 square centimeter
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