Consider a right-angled triangle with an inside angle of 30° and a hypotenuse of 8cm. Calculate the length of the opposite side to the 30° angle.

Recall the trigonometry rule SOH/CAH/TOA (Silly Old Hitler Couldn't Advance His Troops Over Africa).

1. Label:   Draw the triangle and label the sides with Hyp, Opp & Adj.
   
2. Choose:  Pick which equation to use from SOH/CAH/TOA. In this case, we choose "SOH" because we want to find the opposite side
         and we are given the angle and the length of the hypotenuse.
   
3. Cover:   Using the triangle form of the equation for SOH, cover up what you want to find and write down the expression of what
        you see. So opp = sin(angle) x hyp
   
4. Substitute:  opp = sin(angle) x hyp then becomes opp = sin(30) x 8
   
5. Evaluate: opp = 0.5 x 8 = 4cm