Răspuns:
aoc=suplementar=>aoc=180grade
aox=xom
poy=yob. mop=boc 180 =xom+xom+mop+poy+poy+mop 180=2xom+2mop+2poy. 180=2(xom+poy+mop) 90 =xom+mop+poy dar xoy=mop+xom+poy =99 grade
