Introduction to trigonometry. Students will investigate for themselves the three trig ratios. Then they will be used in a variety of different situations. By the End of this 10 paged booklet all students will be able to answer any question thrown at them on right angled trigonometry. A couple of us created this booklet back in the late 1980's some minor alterations have taken place over the years. For the past 20 plus years it has always worked for me, including with low ability students. The book works along side some board work which I have in the form of several power points which I will upload to this site as well.