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
4274 answers (Tutor Details)
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".