In triangle $ABC$, $BC=7$ cm, $\angle BAC=42^\circ$ and $\angle ABC=58^\circ$. Find \(\angle

Question

In triangle $ABC$, $BC=7$ cm, $\angle BAC=42^\circ$ and $\angle ABC=58^\circ$. Find $\angle ACB$. Calculate $AC$, giving your answer correct to 3 significant figures.

Accepted Answer

(a) $80^\circ$; (b) $8.872$ cm.

Sec 3/4 E Math T06-Q20 - Applying the sine rule

Sec 3/4 E Math T06-Q20 - Applying the sine rule

Solution:

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