Beginner-friendly steps
“Common points” means points that belong to both angles at the same time.
- Look at the vertex.
Both angles are drawn from the same corner (the same vertex).
This gives one common point: the vertex.
- Check the arms.
The two angles share one arm (one boundary ray).
On this shared arm, the marked angles meet at one more point.
- No other overlap.
Apart from the vertex and that one point on the shared arm, there are no other common points.
So, the total number of common points is:
\(1\) (vertex) \(+\) \(1\) (on the shared arm)
= \(2\)