1. Finding a Missing Angle of a Right Triangle

2. EXAMPLE #1  First: figure out what trig ratio to use in regards to the angle.  Opposite and Adjacent O,A means we use Tan!  Second: set up the tangent ratio.  Third: use the inverse key (2 nd key). x 27 33

3. EXAMPLE #2  First: figure out what trig ratio to use in regards to the angle.  Opposite and Hypotenuse O,H means we use Sin!  Second: set up the sine ratio.  Third: use the inverse key (2 nd key). x 45 33

4. EXAMPLE #3  First: figure out what trig ratio to use in regards to the angle.  Adjacent and Hypotenuse A,H means we use Cos!  Second: set up the cosine ratio.  Third: use the inverse key (2 nd key). x 48 26