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Dau coroana !!!!!!!!!!!!!!!!!!

Dau Coroana class=

Răspuns :

calculam apotema bazei
ab-apotema bazei
ab=l√3/√6
OM²=VM²-VO²=15²-9²=225-81=144
OM=√144=12
OM=ab
12=l√3/6
l√3=72
l=24√3-latura bazei

MB=BC/2=24√3/2=12√3
VB²=VM²+MB²=15²+(12√3)²=225+432=657
VB=√657=3√73