Question

A horizontal line has points D, B, C. A line extends vertically from point B to point A.

Given that Ray B A bisects ∠DBC, which statement must be true?
a) m∠ABD = m∠ABC
b) AB ≅ BC
c) B is the midpoint of DC.
d) m∠DBC = 90°

Answer 1

A: m∠ABD = m∠ABC

Answer 2

a) m∠ABD = m∠ABC

Explanation:

The meaning of angle bisector is that each of the created angles is congruent to the other:

m∠ABD = m∠ABC