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# Vectors C4 watch

1. Im stuck on part D. Ive drawn a diagram for it but i dont know what to do.
2. (Original post by pineneedles)

Im stuck on part D. Ive drawn a diagram for it but i dont know what to do.
3. (Original post by TeeEm)
Just apply the matrix

0 -1
1 0
4. You found the point of intersection which is the centre.

Do vector arrows and find a route for origin to B.

Also, remember that circles have equal radii .
5. (Original post by TeeEm)
Sorry, hahah, I took the picture on my tablet, that's cute

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6. (Original post by Kvothe the arcane)
You found the point of intersection which is the centre.

Do vector arrows and find a route for origin to B.

Also, remember that circles have equal radii .
How do you know that the point of intersection is the centre of the circle? And I did think about that! CA = CB but I don't know what C is

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7. (Original post by pineneedles)
How do you know that the point of intersection is the centre of the circle? And I did think about that! CA = CB but I don't know what C is

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A and B lie on l1. C lies one l2. As A and B are points on the circle's arc then part of l1 is the diameter so C has to be the intersection of both lines. You found out C in part (c).

What might be equal to?
8. (Original post by Kvothe the arcane)
A and B lie on l1. C lies one l2. As A and B are points on the circle's arc then part of l1 is the diameter so C has to be the intersection of both lines. You found out C in part (c).

What might be equal to?
I'm sorry, I still don't understand. I don't see how with the information given you can say that part of L1 is the diameter, it could pass through the circle so that it forms any chord, not necessarily the diameter?
By the way, have you read the kingkiller chronicles too? I love those books (Kvothe)

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9. (Original post by pineneedles)
I'm sorry, I still don't understand. I don't see how with the information given you can say that part of L1 is the diameter, it could pass through the circle so that it forms any chord, not necessarily the diameter?
By the way, have you read the kingkiller chronicles too? I love those books (Kvothe)

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I made an assumption. I apologise. Still, the method is the same. You are right that it could be a chord but l1 and l2 are perpendicular. As l2 cuts through the centre then it has to bisect the chord or diameter line that l1 makes with the circle.

Yes, I've read the Kingkiller Chronicles. This name isn't a coincidence .
The perpendicular from the centre to the chord bisects the chord
http://www.bbc.co.uk/schools/gcsebit...s2hirev7.shtml
10. (Original post by Kvothe the arcane)
I made an assumption. I apologise. Still, the method is the same. You are right that it could be a chord but l1 and l2 are perpendicular. As l2 cuts through the centre then it has to bisect the chord or diameter line that l1 makes with the circle.

Yes, I've read the Kingkiller Chronicles. This name isn't a coincidence .
The perpendicular from the centre to the chord bisects the chord
http://www.bbc.co.uk/schools/gcsebit...s2hirev7.shtml
Ah God it just clicked, thanks so much.

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11. (Original post by pineneedles)
Ah God it just clicked, thanks so much.

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Better to click now than in the exam, ey.

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Updated: January 31, 2016
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