Question

What is the missing justification?

transitive property
reflexive property
symmetric property
substitution property

Answer 1

Transitive property

Explanation:

Given

See attachment

Required

The missing property?

In step 1, we have:

`\angle A \cong \angle B,\ \angle C \cong \angle B`

Transitive property states that:

If
`a = b` and
`b = c`

Then
`a = c`

Similarly:

If
`\angle A \cong \angle B` and
`\angle C \cong \angle B`

Then
`\angle A \cong \angle C` --- step 3

Hence, we can conclude that the transitive property is the missing justification