Volume and Surface Area of a Hollowed Composite Solid
Volume and Surface Area of a Hollowed Composite Solid
Secondary 2
Figure above shows a conical space that is hollowed out of a cylinder. The cone is as tall and wide as the cylinder. The cone is entirely filled with water to its brim. If the volume of water is \(484\pi \)cm\(^{3}\) and \(AB=12\) cm,
- find the radius, \(r\) cm, of the cone.
- Hence, find the area of the surface in contact with water. Leave your answer in two decimal places.
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Answer:(a) \(11\text{ cm}\) (b) \(562.56\text{ cm}^2\)
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