Răspunsuri

2014-10-03T10:13:58+03:00
Vabc piramida regulata.=> va=vb=vc si baza este triunghi echilateral =>

Apotema bazei= h Δechilateral/3=
bc* √3/6=10√3/6=5√3/3
Apotema piramidei=√[va²-(bc/2)²]=√(13²-5²)=√144=12