Question

Rezolvare completa. Coroana

Answer 1

$\text{Dacă BP=SC, atunci PC=AS }\\ BO=⅓×BS \\ <BAP=⅓<BAC=⅓×60°=20° \\<APB=180°-(20°+60°)\\ <APB=100° \\ \\ <PBO=⅓×60°=20°\\ <POB=180°-(20°+100°)\\<POB=180°-120°\\ <POB=60° \\ \\\ \implies <AOB=180°-60°\\\implies <AOB=120°$