An diofar eadar na mùthaidhean a rinneadh air "Cruinne"
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Loidhne 13:
:''x'' = ''r'' cos(φ) sin(θ)
:''y'' = ''r'' sin(φ) sin(θ) (0 ≤ θ < π
:''z'' = ''r'' cos(θ)
(seall [[foincseanan triantanach]] agus [[co-òrdanaich cruinn]]).
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