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In two congruent triangles A B C\ a n...

In two congruent triangles `A B C\ a n d\ D E F ,` if `A B=D E\ a n d\ B C=E Fdot` Name the pairs of equal angles.

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A D ,\ B E\ a n d\ C F , the altitudes of A B C are equal. Prove that A B C is an equilateral triangle.