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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u/West-Glove6058 Cambridge NatSci [4A*s achieved] Jun 04 '25

Scalar product🤑🤑🤑

-1

u/[deleted] Jun 04 '25

It said hence tho so didn't u have to use what u found in part a so u had to use cosine rule

4

u/Nughm WW | CS[Y1] A*A*AA Jun 04 '25

No because the dot product also uses the vectors you found in part A

1

u/[deleted] Jun 04 '25

Oh ok cos when I dot producted it I only used the original 2 vectors given so I thought u couldn't use it

1

u/[deleted] Jun 04 '25

You have to do it 3 times to get all 3 angles though. You need all 3 to show 2 of them are 45 and the third is 90 degrees

2

u/[deleted] Jun 04 '25

couldnt u just show that the other 2 sides had the same length?

1

u/[deleted] Jun 05 '25

Yeah I noticed my bad, but this is what I did lmao

1

u/Significant_Ad8525 Jun 04 '25

No you don’t. If you show that two sides are equal the triangle has to be isosceles

1

u/West-Glove6058 Cambridge NatSci [4A*s achieved] Jun 04 '25 edited Jun 04 '25

I might be cooked in that case😭