Jxinlim's answer to AX's Secondary 3 E Maths Singapore question.

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Jxinlim's answer
3 answers (Tutor Details)
Using tan rule, to find angle OAN.
To search for radius of circle, which is OA. To help u search the result on further parts.
Angle OAN is twice of angle OCD.
Therefore, use cos rule to get the length of MC.