Third questions The surface area and volume of sphere, cylinder and cone are calculated by class inheritance, virtual function, abstract class inheritance and interface.

Filename	Size	Update
003\.vs\003\DesignTimeBuild\.dtbcache	370960	2019-10-17
003\.vs\003\v16\.suo	25088	2019-10-31
003\.vs\003\v16\Server\sqlite3\db.lock	0	2019-10-17
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003\003.csproj	219	2019-10-17
003\003.sln	1111	2019-10-17
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003\obj\Debug\netcoreapp2.1\003.assets.cache	20697	2019-10-17
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003\obj\project.assets.json	39568	2019-10-17
003\Program.cs	2454	2019-10-17
003\.vs\003\v16\Server\sqlite3	0	2019-10-31
003\.vs\003\v16\Server	0	2019-10-17
003\.vs\003\DesignTimeBuild	0	2019-10-17
003\.vs\003\v16	0	2019-10-17
003\bin\Debug\netcoreapp2.1	0	2019-10-17
003\obj\Debug\netcoreapp2.1	0	2019-10-17
003\.vs\003	0	2019-10-17
003\bin\Debug	0	2019-10-17
003\obj\Debug	0	2019-10-17
003\.vs	0	2019-10-17
003\bin	0	2019-10-17
003\obj	0	2019-10-17
003	0	2019-10-17

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