The content is just an excerpt from the complete note for SS1 Third Term Further Mathematics Lesson Note – Trigonometric Ratios of General Angles. Check below to download the complete DOCUMENT
WEEK 5
TOPIC: TRIGONOMETRIC RATIOS OF GENERAL ANGLES
CONTENT:
450, 600.
QUADRANTS AND ANGLES
The direction to which angles are measured can either be clockwise or anticlockwise. The plane is divided into four partitions by the axes. Each partition is called a quadrant.
The Y – axis and X – axis divides the plane into 4 parts (or 4 quadrants) as shown in the figures below:
Angles are measured relative to the positive x-axis. A positive angle is measured anti-clockwise while a negative angle on the other hand is measured clockwise.
BASIC TRIGONOMETRIC RATIOS
In your Junior School, you learn about angles and how they are measured. Can you still recall how to find the sine of an angle? The below can guide you.
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