The radius of the external diameter is 4.5 cm and the radius of the internal diameter is 2.5 cm.
The volume of metal in the casting can be found by subtracting the volume of the inner cylinder from the volume of the outer cylinder.
Volume of outer cylinder = π × r^2 × h = π × (4.5 cm)^2 × 8 cm = 254.47 cm^3
Volume of inner cylinder = π × r^2 × h = π × (2.5 cm)^2 × 8 cm = 157.08 cm^3
Volume of metal in casting = Volume of outer cylinder - Volume of inner cylinder
= 254.47 cm^3 - 157.08 cm^3
= 97.39 cm^3
Therefore, the volume of metal in the casting is 97.39 cm^3.
A cylindrical casting of height 8cm and external and internal diameters 9cm and 5cm respectively. Calculate the volume of metal in the casting
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