Lesson 1
1. Lesson 1
1.3. Refresher
Module 2: Trigonometry
Refresher
Review the use and meaning of the formula a2 + b2 = c2 in Pythagorean Theorem.
Print or save Primary Trigonometric Ratios Chart to review and keep handy.
Practise identifying the sides of a triangle by dragging and dropping the opposite, adjacent, and hypotenuse sides into their correct locations in Exploring Trigonometry.
Review examples of different types of trigonometry problems in Introduction to Trigonometry.
Review the four quadrants and the coordinates of a point on the plane in Cartesian Plane.
Your calculator must be set to degree mode for all calculations in Mathematics 20-1.
Just like there are different units of measure for distance (for example, kilometres and centimetres), there are different units of measure for angles (for example, degrees and radians). And just like you would get an incorrect answer if you used kilometres where centimetres were expected, you will get incorrect answers if you use radians or grads instead of degrees.
Have a look at your calculator screen. Typically, calculators will show “Deg,” “Rad,” or “Grad.” If your calculator shows “Deg,” it is in degree mode. If your calculator shows “Rad” or “Grad,” you need to press the Mode or DRG button until you see “Deg.”
If you cannot determine how to set your calculator to degree mode, you will need your calculator’s manual. These manuals can often be found on the Internet by entering your calculator’s make and model number into a search engine.
Go back to the Are You Ready? questions and try them again. If you are still having difficulty, contact your teacher.