No. [Assuming you said vertically opposite angles first] iBibah got angle QTX as alpha from a different argument. Cannot say vertically opposite because there is no guarantee QTP is straight UNLESS you used a different argument of finding alpha.
I'm gonna say it's a poor choice of wording. Well at least to me it sounds ambiguous. The sentence quoted makes no sense to me. Or maybe my English isn't up to scatch
The last question will be projectile motion I went to the future came back and then went to Mcdonalds and saw a future 2030 HSC marker showing the 2013-2029 3u HSC papers to me