| ||

## Trigonometric Ratios and Reference Angles of General Angles

** Description:**This applets enables pupils to visualize what is the reference angle of any general angle in trigonometry.
At the same time, it shows how to determine the trigonometric ratio of any general angle (between -1440 to 1440 degrees)
through visualizing the appropriate reference triangles in a unit circle around the 4 quadrants.

**Subject(s):**

**Educational Level(s):**

**Instructional Component Type(s):**- Curriculum: Lesson Plan

- Contributed By: lewws lewws

**Introduction:**

This applet can be used for classroom demonstration or for student self directed learning or revision

**Group Size:** Any

**Learning Objectives:**

At the end of the lesson, students should know how to

- determine which quadrant the general angle lies in

**Guiding Question:**

- Which quadrant does your general angle lie?

**Materials:**

Applet as provided.

**Procedures:**

Move the Angle Slider to the left or right.
This will decrease or increase the general angle
Click on each of the checkboxes to reveal the appropriate attributes eg reference/principal angle, reference triangle, trigonometric ratios, positive trigonometric ratio regions etc.

**Assessment:**

Not applicable (NA)

**Answer Key or Rubric:**

NA

**Benchmark or Standards:**

GCE O Levels

**Attached Files:**

trigogenangleratios-vggb4.i2g |