By: Jasemar Reid

Trig is basically geometry and the study of angles and the relationships of three- dimensional figures. It’s also the study of how the sides and angles of a triangle are related to each other.

The height to the hypotenuse of a triangle is called the sine (pronounced like the word “sign”), it is abbreviated as SIN.

The base to the hypotenuse is called the cosine (pronounced like the word “co-sign”), it is abbreviated as COS.

The reference angle is the positive acute angle that can represent an angle of any measure. Basically, any angle on the x-y plane has a reference angle, which is always between 0 and 90 degrees. The reference angle is always the smallest angle that you can make from the terminal side of an angle (ie where the angle ends) with the x-axis.

Degree 2 Radian:

Just simply do Degree x ∏ 180

EXAMPLE:

90° x ∏ ‗ .5∏ 180

Radian 2 Degree:

Just simply do EX: 4∏ . 180 = 240°

3 ∏

1. Cancel out the pi signs.

2. Then simply.

A coterminal angle is when the angle have the same terminal side.

Example:

30° is coterminal with 360° + 30° = 390°.  They have the same terminal side.

Example 2:

−90° is coterminal with 270°.

 Some angles has exact values of their trigonometric functions. Angles 0° and 90° cannot be acute in a right angled triangle that’s why there is a symbol in the table which means it is undefined.

I hope u learned and enjoyed the presentation.