The angles are labelled with capital letters. The opposite sides are labelled with lower case letters. Notice that an angle and its opposite side are the same letter. The sine rule is: \(\frac{a} ...

sin x^\circ = 0.5\) \(x^\circ = {\sin ^{ - 1}}(0.5)\) \(x^\circ = 30^\circ\) So we know that the first solution is 30˚ as previously predicted from the graph. To get the other solution ...