Question

What is the missing reason in the proof?

Answer 1

We know that two angles are congruent if their values are the same or in other words if they are equal. Now, in step #2 it is given that $m\angle ABC=90^{\circ}$ and in step #7 it has been proven that $m\angle ABD=90^{\circ}$. Thus, since both the angles, $\angle ABC$ and $\angle ABD$ have equal values or equal measures, both amounting to $90^{\circ}$. Therefore, by definition of congruent angles, $\angle ABC \cong \angle ABD$/.

Thus, the missing reason in the proof at step #8 is "definition of congruent angles".

Answer 2

Answer:

c

Step-by-step explanation: