In Chapter 4 I learned about Trigonometry.

In lesson 1, I learned about the Trigonometric Ratios. The three ratios are Sine (opposite over hypotenuse), Cosine (adjacent over hypotenuse), and Tangent (opposite over adjacent). I also learned about SOH COH TOA, and what it means. SOH represents the sine ratio, COH represents the cosine ratio, and TOA represents the tangent ratio.

In lesson 2, I learned how to use a calculator to solve trig ratios. When given the ratio, I need to find the angle and vice versa, to do this we use the inverse operations of said ratio.

In lesson 3, I learned how to calculate the length of a side in a right triangle and how to cross multiply to solve.

In lesson 4, I learned how to calculate the measure of an angle in a right triangle. In order to do this, you need to know at least two side lengths of the triangle. And then you use a trig ratio (SOH CAH TOA) and plug in the numbers to solve. I also learned about the angle of elevation and the angle of depression. (Image shown). The angle of elevation is measured upwards from the horizontal line, while the angle of depression is measured downwards from the horizontal line. I learned how to apply this knowledge to solve word problems.

In lesson 5, we reviewed and practised solving right triangles. Depending on the information that was given for each example, we used the Pythagorean Theorem, Trig, or both.

In lesson 6, problem solving was introduced and I learned how to solve them using the trigonometric ratios. I also learned about Bearings which are angles measured clockwise from the north direction and they were also included in the word problems.

And lastly, lesson 7 was more practice and problem solving using trig ratios. These questions were little more complicated and we started solving problems with three dimensional shapes.