Question

Hey guys! a friend and I are confused and could really use the help. could you explain why? thanks!

Answer 1

Answer:cant see it

Step-by-step explanation:

Answer 2

Answers:

1. substitution
2. definition of perpendicular

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Explanation:

The first dropdown box is "substitution" because we are replacing, aka substituting, the $m \angle UXV$ with $m \angle TXU$. This replacement is valid because we are given that $\angle TXU \cong \angle UXV$. They are congruent angles.

The second dropdown box is "definition of perpendicular". If we have a 90 degree angle like this, then the two lines are considered perpendicular simply by definition.