Erfana Beevee Binte Hassan Shariff's answer to stiles's Secondary 4 E Maths Singapore question.
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Triangle OAB is a triangle with all 3 sides known and an unknown angle to find. So u can use the cosine rule. The angle you find here is non reflex angle AOB. Subtract this angle from 2pi to find the reflex angle. Hope this helps.
Date Posted:
8 months ago
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