Respuesta :

sophiemyl

Step-by-step explanation:

make 2 triangles ABO and ACO

compare them

AB=AC

AO is the same in both

and BO=CO

opposite equal sides are equal angles so angleAbBO=angleACO

Lilliana0hyper

theres a fact that says that opposite to equal angles are equal sides and conversely so because AO is equal to both triangles angle ABO and angle ACO are equal