If ÐABC and ÐCBD are a linear pair, then it means that their sum is 180°.
Linear pair of angles are angles formed when two lines intersect each other at a single point.
Now, the angles are also said to be linear if they are adjacent to each other after the intersection of the two lines and the sum of the linear pair of angles is always equal to 180°.
Looking at the definition above we can say that if ÐABC and ÐCBD are a linear pair, then it means that their sum is 180°.
Read more about Linear Pairs at; https://brainly.com/question/14061313
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