In the diagram, $\angle BAC=54{}^\circ $, $AB=4.2$ cm, $AC=3.6$ cm, $CD=5.5$ cm and $AD=8$

Question

In the diagram, $\angle BAC=54{}^\circ $, $AB=4.2$ cm, $AC=3.6$ cm, $CD=5.5$ cm and $AD=8$ cm. Calculate the area of $\Delta ABC$, correct to $3$ significant figures, $\angle ACD$, correct to $1$ decimal place.

Accepted Answer

(i) $6.12\text{ cm}^2$ (ii) $121.7^\circ$

Advanced Euclidean Geometry: The Cosine Rule Challenge

Advanced Euclidean Geometry: The Cosine Rule Challenge

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