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If ∠ABC and ∠CBD are supplementary angles, then m∠ABC + m∠CBD = 180° represents the definition of Question 9 options: A) supplementary angles. B) triangle sum. C) congruence. D) complementary angles.

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Answer:

A.) supplementary angles

Step-by-step explanation:

supplementary angles have the sum of 180 degrees.

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Answer:

A

Step-by-step explanation:

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