We are asked to complete the following statements about the graphed angles:
Question a)
angle 1 congruent to _______
Notice that angle 1 in the image is opposite via the vertex to angle 3.
Amgles opposite via the vertex are always congruent (equal in magnitude) to each other. So, we complete the blank by typing angle 3. These are called "opposed by the vertex" angles.
Question b)
Angle 4 is congruent to angle _______ and they are called are called ______ angles
Angle 4 is congruent to its opposite by the vertex angle (which is angle 2. So we complete the first blank with the number 2.
The second blank is exactly as for the first case, that is "opposite by the vertex".