Abc's answer to idununderstandasinglething's Secondary 4 E Maths Singapore question.
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120 is the largest angle.
Is the largest angle opposite the longest side?
With this information apply cosine rule. (Hint: cos120 = -cos60). Recall the special values of cosine.
Hope this helps
Is the largest angle opposite the longest side?
With this information apply cosine rule. (Hint: cos120 = -cos60). Recall the special values of cosine.
Hope this helps
Date Posted:
4 years ago
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