A point of concurrency in the figure is ______.

Find the type of lines marked in thick lines.

Find the parallel and intersecting line segments in the picture given below.

Observe the figure and give the name of $\angle 1$.

Observe the figure and give the name of $\angle 2$.

Observe the figure and give the name of $\angle 3$.

Observe the figure and give the name of$\angle 1+\angle 2$

Observe the figure and give the name of $\angle 2+\angle 3$.

Observe the figure and give the name of $\angle 1+\angle 2+\angle 3$