Introducing Trig functions
We have three trigonometric functions: sine, cosine and tangent. These are commonly abbreviated to 'sin' 'cos' and 'tan'. Trigonometric functions work with angles.
Move the right angle and change the value of . Look at what happens with the calculations
How do the trig functions relate to the ratio of sides?
Is cos () =
Is tan () =
Is sin () =
SOHCAHTOA is used in Trigonometry to help us remember the functions. What does it mean? Hint: how does it relate to the above ratios?
Make a note of SOHCAHTOA so you can remember how to use it on the next activity.