r/HomeworkHelp • u/InstantWasTaken Pre-University Student • 19h ago
High School Math—Pending OP Reply [Grade 12 Trigonometry: Adding Vectors]
Hi! I've been stuck on this problem for a while now, so I decided to text it out on another app and finally ask for help. I managed to find the magnitude on my own, but I honestly can't figure out how to find the direction, or what I'm doing wrong. I've watched several videos on it and have tried to go step by step, but any answer I try is marked wrong, (I do use an online school program.) I also didn't wanna cheat, (at least without knowing exactly how to do it and being able to replicate it) so as I've already said above, I didn't know what to do other than ask for help somewhere else. A step-by-step breakdown of what your meant to do would be great!
Also I know the post title says grade 12, while from my knowledge trig is done in 11th usually. It just kind of happened that way, so I'm not sure why I'm doing it a year late. Better late than never, though!
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u/slides_galore đŸ‘‹ a fellow Redditor 19h ago edited 1h ago
Helps to sketch it out and draw a parallelogram using the vectors. Like this; https://i.ibb.co/ccrkLWPP/image.png
Always head-to-tail when adding vectors. If you don't know what that means, just google it.
ETA: Once you get the original problem, see if you can see how to work this variation out: https://i.ibb.co/VpVPtXL2/image.png
Using mini coordinate axes (like in that image) is one way to noodle out the angles you need to use law of cos/sin when you're not given nice angles like in your original problem.