Answer:
This is a vertical angle theorem
Step-by-step explanation:
Vertical angles are a pair of opposite angles formed by intersecting lines. In the figure, ∠1 and ∠3 are vertical angles. ... Vertical angles are always congruent . So, in this figure, ∠1≅∠3 and ∠2≅∠4 .
4x^2+4x-1
the angle would be 180
45
Answer: b
Step-by-step explanation: since i helped can i have brainlist please :D
