6.
BC=√(6²+8²)=10
O∈BC, BO=OC=OA=10/2=5
MA=√(MO²+AO²)=√(12²+5²)=13
as simple as that!!!!
7.
Rombule alcatuit din 2 tr echilat ; diagonala mica este latura, diag mare este latura*√3
BO=AB/2=4/2=2⇒PB=√(PO²+BO²)=√(2²+2²)=2√2
AO=AB√3/2=2√3⇒PA=√(PO²+AO²)=√(2²+(2√3)²)=4
as simple as that!!!