How to ask professor to explain something again? I had a class last week and I was 10 minutes late. I missed part of the class, and I want to write an email to my professor to arrange a time to meet.
I prepared this email:

Dear .....
I’ve missed part of the previous session and this part is not clear for me.  Could I meet up with you this week so you can explain it to me?
Thank you

Is it appropriate?
I would like to take a different perspective than Buffy:

You were late (maybe even disrupted the course when entering the room) and missed something. Now you want additional time from your teacher to catch up something which happened in the first 10 minutes - which will take ~5-15 minutes of the working time of your teacher. Multiply this by 100 students and 5 courses per week, and you will spot the problem ;-). 

Therefore, I would suggest to try everything you can do to catch up on your own. Ask other students. Use books. If you invested >3h without success, you can still write this e-mail explaining what you already understood, where you struggled and at which point you need specific help. 

This will show your professor you are really engaged and makes it easy to answer your question within seconds. Maybe (s)he will ask you "just to talk a few minutes after the next lecture" which is also very time effective. 

The behavior also depends a bit on your local student-teacher-relationship. In my course, I would not mind if you just approach me after class, you will receive a little (friendly but sarcastic) remark about being late, and get an answer (and I'm happy that someone is trying to learn something).