Another way to resolve the triangle which wasn't bourne with a right angle, is to make lots of right angles by drawing lines perpendicular to each side and bisecting the angle opposite.
The, if you want you can sort out all the other bits
https://uploads-cdn.omnicalculator.com/images/height-freeform.png
I also remember my old school report.
The two things which stood out most were;
Could have done better
A good listener
The first bullet point was a straight forward cut'n paste at pretty well every opportunity.
The second strange remark was from the music master. He didn't like brass bands and I just happened to be principle soloist in the national and local schools and youth brass bands at the time.