Mathematics, 28.07.2021 17:00 RioQNA

Cho góc nhọn xOy, trên tia ax lấy điểm A, B sao cho Oa bằng 3cm , OB bằng 5cm trên tia Oy lấy điểm C, D sao cho Oc bằng Oa , Od bằng Ob. Nối AD và BC cắt nhau tại I a, chứng minh góc OAD bằng góc OCB
b, chứng minh IA bằng IC
d, chứng minh OI là tia phân giác của góc xOy

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