Răspuns :
VM este apotema piramidei => VM - inaltime in triunghiul VBC , apoi in triunghiul VMC dreptunghic in M afli cu pitagora apotema piramidei . BAFTA !
VBC-fata laterala
fie VM_|_BC,
M∈BC
BM=MC=BC/2=10/2=5
VM-apotema
ΔVMB,mas<M=90
VM²=VB²-BM²= 13²-5²= 169-25=144 ⇒VM=12
fie VM_|_BC,
M∈BC
BM=MC=BC/2=10/2=5
VM-apotema
ΔVMB,mas<M=90
VM²=VB²-BM²= 13²-5²= 169-25=144 ⇒VM=12