# Thread: 3U Cambridge 11 Homework; Help!

1. ## 3U Cambridge 11 Homework; Help!

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This is a question from chapter 4, 3U Cambridge yr 11. How would you do questions (i) and (ii)?
Thank you in advance!

2. ## Re: 3U Cambridge 11 Homework; Help!

i) Construct the centre point O. Connect that point with A and C to form Triangle AOC.

OA = OC = 6 (Radii of circle)
Angle AOC = 30 (angle at the centre is twice the angle at the circumference)
Now simply use the cos rule to find AC.

ii) One way I see is using the sine rule to find the value of one of the other sides, then use the formula $\frac{1}{2}ab \sin(C)$ to get the area.

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