Is it weird to ask a girl to hook you up with her friend?

[Douglas]

I'm a sophomore in high school and I have little experience in relationships, but I've been told I'm attractive by several girls. A friend of mine that I went to school with last year has switched schools and has posted several pictures on Instagram of herself and a girl she goes to school with, and I looked at this girl's own Instagram account and she's very pretty, and from what I can tell from her activity, nice. Would it be weird to ask my friend if her friend (the pretty one) is single and if she might be interested in me? How would be the best way to ask?
The girl I want my friend to introduce me to/hook up me up with is definitely more attractive than her. The only other slight complication is that I used to have a crush on my friend and she knew but didn't feel the same way, but we became pretty good friends although we barely see each other and I have no interest in her now.