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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.
https://www.geogebra.org/m/VuGxbHkM
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This is your Sidebar, which you can edit like any other page in your workspace.
This Sidebar appears everywhere on your workspace. Add to it whatever you like -- a navigation section, a link to your favorite web sites, or anything else.
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