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Year 9 Maths Advanced Trigonometry

Finding Unknown Side

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Questions
Question 1
115143

In \(\triangle ABC\), \(\angle ABC = 90^\circ\), \(\angle ACB = 21^\circ\) and \(AC = 11.8~\text{cm}\). Find the length of \(AB\), correct to one decimal place.

Right-angled triangle ABCTriangle ABC with the right angle marked, the given angle and the side AC = 11.8 cm labelled 21° 11.8 cm B C A
4.2
 \(~\text{cm}\) (1 d.p) 2 marks

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