1. Trigonometry 2 Finding the angle when the sides are given

2. Reminder (The three rules) Reminder (The three rules) S O H C A H T O A

3. Example 1 Example 1 5cm 3cm x Step 1 identify the sides you have been given, and so the formula required Step 2 substitute the known values in to the equation Sin x= 3 / 5 =0.6

4. Using your calculator We need to find the solution to Sin x=0.6 Depending on your calculator you do the following 0.6 2nd sin =36.87 o 0.6 inv sin =36.87 o 2nd sin 0.6= 36.87 o Sin -1 0.6 =36.87 o

5. Example 2 Example 2 9cm 4cm x This time we have the adjacent and opposite sides given So tan x= 9 / 4 =2.25 Using the calculator X=66 o