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Example 1: Incomplete proof proving ∠BCG ≅ ∠ABE, with missing reasons for Steps 3 and 6, involving parallel lines and transversals.

Diagram showing geometric proof of triangle congruence with labeled angles and lines, including EF parallel to GH and transversal AD intersecting at points B and C.

Diagram showing geometric proof of triangle congruence with labeled angles and lines, including EF parallel to GH and transversal AD intersecting at points B and C.

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