Answer:
reflexive property
Step-by-step explanation:
The whole proof or just reason 3? I'll edit my answer if you need more.
WY ≅ WY because of the 'reflexive property'.
The reflexive property of congruence states that an angle, line segment, or shape, is always congruent to itself. WY and WY are the same line segment as you can see, so they are congruent by the reflexive property.
