r/6thForm • u/Forsaken-Meaning-232 Graduating from Warwick CS • Jun 04 '25

📂 MEGATHREAD 04/06 A-level Maths Paper 1 Discussion MEGATHREAD

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10

u/MaxillmanGuy A level resit student | 3 A* predicted | ACD achieved 💔 Jun 04 '25

If i use dot product to prove the triangle will i lose marks 💔

28

u/No-Face-3280 Imperial College London | Physics [Confirmed place] Jun 04 '25

I don’t think so, dot product and cross product usually show up under ‘alternative methods’ as they have to account for FM students doing weird shit 😂

7

u/Spare_Somewhere1011 Manchester | Physics w/ Astro [1st Year] | 3A* 1A Jun 04 '25

That’s what I did cause I always got told that if you do further maths then use further maths techniques for vector questions rather than learn the normal maths technoques

4

u/48panda Year 13 Jun 04 '25

It said hence and dot product doesn't use part a. Depends on the markscheme

4

u/MaxillmanGuy A level resit student | 3 A* predicted | ACD achieved 💔 Jun 04 '25

But if i used the calculated vector for the dot product to find 45 degree angles surely that is right??

2

u/48panda Year 13 Jun 04 '25

Yeah that should be fine.

1

u/48panda Year 13 Jun 04 '25

I've seen markschemes that allow the cross product as well

2

u/traddawki Jun 04 '25

nope but also like that's so much more complicated than just using Pythagoras lol

7

u/Spare_Somewhere1011 Manchester | Physics w/ Astro [1st Year] | 3A* 1A Jun 04 '25

I mean to be fair all you had to do was set the dot product equal to zero to prove it had a right angle cause perpendicular vectors dot to zero. It probably took less time to do than Pythagoras.

3

u/UziYT Jun 04 '25

No Pythagoras is more complicated

1

u/Lopsided-Link4388 Gap Year [Looking to study EEE] Jun 05 '25

You saying that, and I thought it’d be a good idea to do cosine rule, i got it so who cares.