Piramida, corpul geometric care are ca bază un poligon, iar fețele laterale sunt triunghiuri., Piramidă patrulateră, piramida care are baza pătrat., Piramidă triunghiulară, piramida care are baza triunghi., Tetraedru regulat, piramidă triunghiulară regulată care are toate cele 4 fețe (inclusiv baza) triunghiuri echilaterale congruente

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