Original post by Le1234545
OA = i + 4j OB = 5i + 5j CB = -i +6j
A) Find the vector AB and state it's length
i got root 5 or 4i + j and CM
B) Determine the length of AC
I got 5i -5j
C) Calculate the size of angle ABC
Is it trig?
OA = root 5, OB = root 10, CB = root 5 and AB = root 5
A) Find the vector AB and state it's length
i got root 5 or 4i + j and CM
B) Determine the length of AC
I got 5i -5j
C) Calculate the size of angle ABC
Is it trig?
OA = root 5, OB = root 10, CB = root 5 and AB = root 5
;sounds like the cos rule when you know 3 side lengths.
Original post by Le1234545
So what would the answer be or how you go about it?
You must have covered it if you're doing questions about it
https://www.bbc.co.uk/bitesize/guides/zsgjxfr/revision/8
You know a,b,c which you can use to calculate cos(A)
Edit - it looks like you've made mistakes in calculating side lengths, so make sure they're right first. Use pythagoras to calculate the length or magnitude of a vector.
(edited 4 years ago)
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