Practical applications include when you need to calculate how much material you need to make such a cone; how much paint you need to cover it; or when you want to find out the mass of the cone (the first and third examples assume it isn't a solid cone, but only has a thin layer).
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it is a cone
An old fashioned DUNCE hat!
ice cream cone teepee birthday hat witch hat traffic cone pencil tip funnel sno cone dunce
Surface area: when you want to paper a room or pain it. Volume: When you want to know how much stuff you can cram into the boot of your car, or in a fridge, suitcase.
cyclinder = soda(can) cone = ice-cream cone rectangular (3d) = shoe box circle = beach ball