“what is the sum of the angles of a triangle” 180 degrees
Notice that the reflection is over a line of the form x=constant; in this case, the y-coordinate of the reflected point stays the same while the x-coordinate changes as expressed by the transformation below

Hence, in our case

Transform points N, M, and O accordingly,

<h2>Therefore, the answer is the first option (top to bottom)</h2>
Answer:
m∠60
Step-by-step explanation:
30 + 90 = 120
180-120=60