Eric Nicholas K's answer to afiqah's Secondary 4 E Maths Singapore question.

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Eric Nicholas K
Eric Nicholas K's answer
3609 answers (Tutor Details)
1st
We need to use the cosine rule and set the angle form in the calculator to radian mode to find the angle.

In part B, we need to find the length of the major arc, of which the angle is "360 degrees minus AOB", or "2 pi radians minus AOB".