Trigonometric Functions and Quadrantal Angles

Trigonometric Functions and The Unit Circle

Today’s Objectives:

1. Define what is a Unit Circle.

2. Define the 6 Trig Ratios using x, y and r.

3. Solve the six Trigonometric Functions of

Quadrantal Angles.

The Unit Circle

What makes a unit circle, a unit circle?

IA unit circle is a
circle centered at the
origin

with a radius of 1
unit.

Redefining the Six Trigonometric Functions
Using x, y and r on the Unit Circle

Interactive Notes

Evaluating the Six Trigonometric Functions Of
Quadrantal Angles

Example 1: Evaluate sin, cos, tan, csc, sec and
cot 90⁰.

Evaluating the Six Trigonometric Functions Of
Quadrantal Angles

Example 1: Evaluate sin, cos, tan, csc, sec and
cot 90⁰.

Reflect on our objectives today, which of these
objectives do you fully understand? Which of the
objectives need clarification?

Today’s Objectives:

1. Define what is a Unit Circle.
2. Define the 6 Trig Ratios using x, y and r.
3. Solve the six Trigonometric Functions of

Quadrantal Angles.