Question 1)
We can detonate a line segment and its measure as:
In the case of congruence and equality of figures, remember that two equal figures are congruent, they have the same measures in terms of sides and angles and they even occupy the same space on the plane or space. Then, the notation is:
Where C and D are two figures.
Question 2)
When we cross a pair of parallel lines with a transversal, we obtain 8 angles. Given any of them, we can determine the rest with the corresponding, alternate interior, alternate exterior, and consecutive angles relations that can be applied to the specific arrangement of 2 parallel lines being cut by another line. The answer is yes, you can do so.