An diofar eadar na mùthaidhean a rinneadh air "Cruinne"
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Loidhne 22:
Tha farsaingeachd uachdar na cruinne le radius ''r'' air a thoirt le 4π''r''<sup>2</sup>, agus tha a tomad air a thoirt le 4π''r''<sup>3</sup>/3.
[[Category:Cruthan]]
[[Category:Matamataigs]]
[[de:Kugel]]
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