Tính chất của đường phân giác
Trong một tam giác, đường phân giác của một góc chia cạnh đối diện thành đoạn thẳng tỉ lệ với hai cạnh kề với hai đoạn ấy.
Chú ý: Trong tam giác ABC, nếu D là điểm thuộc đoạn thẳng BC và thỏa mãn
\[\frac{DB}{DC}=\frac{AB}{AC}\]
thì AD là đường phân giác của góc A
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