Working with trigonometric relationships in degrees Trigonometric functions can have several ... Calculating the area of a triangle using trigonometry Trigonometry can be used to find the area ...

Use as an introduction or recap to lessons on trigonometry. Discuss with students that the different trig functions are based on ratios and show this by comparing similar triangles.

To visualize the trigonometric functions for these angles we draw imaginary right triangles in which one side has a length of 0. The triangle for 0 degrees is shown in Figure 20.55. From Figure 20.55 ...