ladayna ab= 5 cm 3ayin majmou3at ni9at M haythou MA² - MB²= 0 3ayin majmou3at ni9at M haythou CHOU3A3 MB YOU3AMID CHOU3A3 MA ISTANTIJ MAJMOU3AT NI9AT M TOUHA9I9 MA²-MB² =0 WA MA .MB =0