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In the triangle ABC, AB=9 centimetres, B...

In the triangle ABC, AB=9 centimetres, B C=12 centimetres. The line B D is the bisector of angle B. What is the ratio of the areas of triangle A B D and triangle B C D ?

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The ratio of the areas of triangle ABD: Delta BCD =A B: B C=9: 12=3: 4
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