## The Sine Rule

We can use the sine rule to

| 1.Find a side when it is opposite and a known angle and we also have another side opposite another angle, both of which we know: |

| 2. Find an angle when it is opposite an known side and we also have another side opposite another angle, both of which we know |

| To find the side as in 1 we start by labelling the sides a,b,c and the angles A,B,C with sides opposite their respective angles as shown. |

| To find an angle we start by labelling the sides a,b,c and the angles A,B,C with sides opposite their respective angles as shown. |