Trigonometry (III)

Mathematics SSS 1 Third Term

WEEK 7

Trigonometry (III)

Performance Objectives

Students should be able to;

1. Participate in the construction of a table of value
2. Plot the points from the table of value obtained
3. Draw the graph of trigonometry

Trigonometry ratios related to the Unit Circle

Content

1. Angles between 0⁰ and 360⁰.

Consider a circle of radius one unit and centre at O, the origin, in the XY plane.

The circle is called a unit circle. Point P has co-ordinate (x,y) and lOPl = 1 unit.

Line Op makes an angle of θ with Ox.

In the right-angled triangles,

Sinθ = y1 = y

Cosθ = x1 = x

The Y-axis and x-axis divides…