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The image of ΔABC after a reflection across Line E G is ΔA'B'C'. Which triangle must be a right triangle and why? ΔA'B'C' is right because it is the image of ΔABC. ΔADC is right because AA' intersects AC at A. ΔBCC' is right because B lies of the line of reflection. ΔBGC is right because Line E G is perpendicular-to CC'.

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