Need help with showing some triangles are similar.

Hi, I was reading a math book and it said triangles PQT and PTR are similar, like it was kind of obvious or something. I tried to prove this for an hour but to no avail. Can someone please enlighten me? Thanks.

I assume that angle QTP will be equivalent to PRT, but I can't see any clear way of that being the case.
Edit: How do I rotate the image? Sorry.

Angle PTQ = angle PRT by the Alternate Segment Theorem. Hence the three angles of the triangles are the same.

**** im so stupid cant believe i've been working on that problem for more than an hour and i overlooked that thank u

I meant "it was sufficiently nonobvious to me that I don't blame you at all for not seeing it".