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If angle A B C and angle C B D form a linear pair, which of the following statements about the angles must be true?

angle A B C and angle C B D are complementary.
angle A B C and angle C B D are complementary to the same angle.
angle A B C and angle C B D are supplementary.
angle A B C and angle C B D are supplementary to the same angle

1 answer

angle A B C and angle C B D are supplementary.