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7-73.

Two triangles: Triangle A, B, C, and its reflection across the base and translated to the right, forming triangle D, E, F. Suzette started a proof to show that if , , and , then . Examine her work below. Then complete her missing statements and reasons.

Statements

Reasons

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.

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.

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Reflexive Property

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Addition Property of Equality (adding the same amount to both sides of an equation keeps the equation true)

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Segment addition

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parts

Copy the diagram onto your paper and mark the given information.

What kinds of congruent angles are created by parallel lines?