a) Calculate angle ACB. Step 1: Determine the interior angle at A, $\angle CAB$. The bearing of C from A is $025^\circ$. This means the angle measured clockwise from the North line at A to the line AC is $25^\circ$. So, $\angle CAB = 25^\circ$. Step 2: Determine the interior angle at B, $\angle CBA$. The bearing of C from B is $337^\circ$. This is the angle measured clockwise from the North line at B to the line BC. The angle measured counter-clockwise from the North line at B to the line BC is $360^\circ - 337^\circ = 23^\circ$. So