O-piramida-triunghiulara-regulata-are-aria-laterala-egala-cu-18-cm²-iar-aria-totala-egala-cu-9(2+√3)cm².-(a)-Aratati-ca-latura-bazei-este-egala-cu-6-cm.-(b)-Calculati-volumul-piramidei.-(c)-Determinati-cosinusul-unghiului-format-de-o-muchie-laterala-cu-planul-bazei.

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2014-05-08T17:30:29+03:00