AI Tutor
Open two fingers like a pair of scissors. The pointy corner where your fingers connect makes an angle.
Just like people have names, every angle has its own name written with three letters and a special symbol: ∠\angle.
How do we pick the right letters to name this corner?

The Corner Goes in the Middle

The pointy corner point is called the vertex. When naming an angle, the vertex letter must always be in the middle.
We place the little angle symbol ∠\angle in front. We can write this angle as ∠ABC\angle ABC or ∠CBA\angle CBA.
Both names work because point BB is the corner in both!
What happens if we put the wrong letter in the middle?

Spotting the Mistake

If corner BB is where the two lines meet, writing ∠BAC\angle BAC is incorrect. That would mean point AA is the corner!