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expected grade boundries for As math p12

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How did people do the area of sector OXD= area of triangle OAD wala sawaal? I got stuck on that for a minute before putting (r^2)/2 theta - ((r^2)sin theta)/2 =((r^2)sin theta)/2 . I got the value of p as 2 in that question. Is that correct?
 
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How did people do the area of sector OXD= area of triangle OAD wala sawaal? I got stuck on that for a minute before putting (r^2)/2 theta - ((r^2)sin theta)/2 =((r^2)sin theta)/2 . I got the value of p as 2 in that question. Is that correct?
yeah the value is 2. I don't know how but I ended up getting p=cos theta ._.
 
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