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ABC and DBC are two isosceles triangles...

ABC and DBC are two isosceles triangles on the same base BC (see Fig. 7.33). Show that`/_A B D\ =/_A C D`

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Given: `ABC` and `DBC` are isosceles triangles
To Prove: `∠ABD = ∠ACD`
Let's join point A and point B.
...
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