A steel pipe is 60 cm long, 8 cm in outer diameter and 6 cm in inner diameter. How many cubic centimeters is its volume?

60*3*3.14*（8^2-6^2)/4

Hollow steel tube is 2 cm in diameter and 8 cm in volume?

Outer radius: 8 / 2 = 4, inner radius: 6 / 2 = 3
Volume: 3.14 * (4 ^ 2-3 ^ 2) * 2 * 100 = 4396 CC

A kind of grinding wheel, the diameter of outer circle is 30cm, the radius of inner circle is 5cm, and the thickness of grinding wheel is 5cm

Outer radius = 15 cm
Volume = (15 × 15-5 × 5) × 5 × 3.14 = 3140 cm3

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