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# C1 question help

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1. Can someone explain part (ii) to me?
I keep on getting radius as just root85/2

Thanks so much
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2. (Original post by greys-anatomy)
Can someone explain part (ii) to me?
I keep on getting radius as just root85/2

Thanks so much
Yore correct for part (ii) but the mark scheme agrees with you anyway.
For (iii) you have to find the intersection of a line perpendicular to the circle at point B. The intersections of this line and the circle are at B and D.
[Hint: use the centre of circle found in part ii to find equation of line and therefore coordinates of D.]
3. what exam board is this :O
4. (Original post by Sirelis)
what exam board is this :O
Yeah which one is it?
5. (Original post by greys-anatomy)
Can someone explain part (ii) to me?
I keep on getting radius as just root85/2

Thanks so much
sqroot85 = diameter (sqroot85)/2 =radius hence 85/4 = r^2
6. Looks like OCR

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