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2022 EOY ACSI P1 Q11

2022 EOY ACSI P1 Q11

IP 2
3 marks

In the diagram, \(\angle ABC = 90^{\circ}\), \( \angle BAC = 45^{\circ}\) and \(AC = \sqrt{98}\) cm. Find,

  1. the length of \(AB\),

    [2]

  2. \( \cos{\angle BAC} \).

    [1]

Solution:

Solution locked

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Answer:(i) \(AB=7\) cm. (ii) \(\cos\angle BAC=\dfrac{\sqrt2}{2}\).

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