Surface Areas and Volumes

⭐ Important Questions

1. Find volume of hemisphere of radius 7 cm.
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   Volume = 23πr³ = 23x227x343 = 23x22x49 = 21563 = 718.67 cm³
2. Cylinder of height 10 cm and radius 7 cm is melted to form spheres of radius 3.5 cm. Find number of spheres.
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   Volume of cylinder = πr²h = 227x49x10 = 1540 cm³\nVolume of sphere = 43πr³ = 43x227x42.875 = 179.67 cm³\nNumber = 1540/179.67 ≈ 8.57 => 8 full spheres