• If you are citizen of an European Union member nation, you may not use this service unless you are at least 16 years old.

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Page history last edited by Laine 1 year, 11 months ago


Kera on pöördkeha, mis tekib ringi pöörlemisel ümber oma diameetri.

Kera pindala võrdub neljakordse suurringi pindalaga

Kera ruumala võrdub kera pindala ja raadiuse ühekolmandiku korrutisega.



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