In triangle $ABC$, $AB=4$ cm, $AC=9$ cm and $\angle BAC=30^\circ$. Calculate $BC$, correct

Question

In triangle $ABC$, $AB=4$ cm, $AC=9$ cm and $\angle BAC=30^\circ$. Calculate $BC$, correct to 3 significant figures.[3] Calculate $\angle ABC$, correct to 1 decimal place.[3]

Accepted Answer

(a) $5.89$ cm (b) $130.1^\circ$

Keeping the obtuse angle

Keeping the obtuse angle

Solution:

Solution locked