Question

∠ABC and ∠CBD are

(A) complementary
(B) supplementary
(C) congruentes
(D) vertical

Answer 1

Supplementary because they add up to 180 degrees

Answer 2

(B) Supplementary.

Explanation:

Note that ABD is a straight line, which means that the total angle measurement is 180°. When two angles (∠ABC & ∠DBC respectively) are combined and form a straight line (180°), they are known as supplementary angles.

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