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Cho tam giác cân `ABC, AB = AC = 10cm, BC = 16cm.` Trên đường cao `AH `lấy điểm `I` sao cho `AI=1/3AH`Vẽ tia `Cx` song song với `AH, Cx` cắt tia `BI` tại` D.` a) Tính các góc của tam giác `ABC` (làm tròn đến phút) b) Tính diện tích tứ giác `ABCD.`
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