Mình co 1 bai toan hinh nho nho? cho cac ban giai thu?
Cho tu giac ABCD co canh AB = a, AD = a cang 3 , BD = 2a. Goi o la` trung diem^? cua BD, OC la duong cao cua :deltaBCD voi OC = ( a cang 3).
a) Tinh so do tat ca cac goc cua tu giac ABCD.
b) Tinh do dai` duong cheo' AC va chu vi cua tu giac ABCD theo a