2026 CSS P1 Q14

2026 CSS P1 Q14

Secondary 4
3 marks

In the diagram, \(\sin\theta=\dfrac35\) and \(\theta\) is obtuse.

Find

  1. the area of \(\triangle ABC\),[1]
  2. the numerical value of \(\cos\theta\), without the use of calculator.[2]

Solution:

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Answer:(a) \(6\text{ cm}^2\) (b) \(-\dfrac45\)

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