**In this module, you will apply your knowledge of sine, cosine and tangent to real-world right triangle problems.**

Below are three examples showing how to find the height of an object using trigonometry.

They are in "feet", so feel free to substitute "metres" for "feet" when you watch the videos.

- Read a step-by-step explanation of real-life trig problemsFor a step-by-step explanation about how to use trig to solve right triangle problems, read this terrific explanation from mathopenref.com. The examples in this explanation use feet instead of metres. If you find a great example in metres, please post it in the "Suggest a link" block on the right. Thanks!
- Read some worked-through real-life trig problemsThis page at purplemath.com shows the steps needed for solving right triangle word problems. The emphasis is on drawing a correct diagram to represent the problem.
- Download a worksheet of real-life trig problemsTry printing the above worksheet and working out some real-life trig problems on your own. (Problems #2 and #3). The answers can be found at http://www.funmaths.com/worksheets/downloads/view.htm?ws0038_2.gif.
- Quiz yourself on real-life trig problemsExamples 3 and 4 in this tutorial by intmath.com give you a chance to check your understanding. Worked-out solutions are provided.

The video above explains how to use basic trig functions on a Casio fx-991 calculator.

0.44 min - setting up 'degree' mode

3.17 min - find an unknown angle

- Online scientific calculator from Calculator.netTo open the scientific calculator in a new window, you MUST click the link.