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secondary 4 | E Maths
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kay
Kay

secondary 4 chevron_right E Maths chevron_right Singapore

i need help for part b and c

Date Posted: 5 months ago
Views: 70

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Eric Nicholas K
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2351 answers (Tutor Details)
1st
Part (c) coming soon
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Eric Nicholas K
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Risky to use sine rule for the last part as angle BAD is not immediately known whether to be acute or obtuse (we cannot always trust diagrams).

It happens that the angle, upon computation by cosine rule, is obtuse.