Question

Given: ∠ABC is a right angle and ∠DEF is a right angle.

Answer 1

Answer:

Step-by-step explanation:

A right angle is an angle whose measure is equal to $90^{o}$. As the measure of two right angles equals angle on a straight line, while four right angles equal the sum of angles at a point.

Given: <ABC, <DEF are right angles.

The missing reasons in the steps of the proof are:

A: m<ABC = $90^{o}$ and m<DEF = $90^{o}$ (Meaning of a right angle)

B: m<ABC = m<DEF (By right angle property)

C: <ABC ≅ <DEF (Congruence property of angles)

Answer 2

Answer:

A: definition of right angle

B: substitution property

C: definition of congruent angles

Step-by-step explanation: