Fundamentals of Trigonometry

Introduction

Trigonometry is an important branch of mathematics.

Trigonometry is a Greek word. The word Trigonometry has been divided into three phases.

It is clear that Trigonometry means Measurement of a triangle.

Unit of Measures of Angles.

What is Angle.

• Two rays have the same initial points make an angle with each other.
• The starting point is called the initial point and the other is called the ending point or terminating point.

Property of Triangle

• The hypotenuse is always the longest side and it is the opposite of the right-angle.
• The opposite side of the triangle that side is opposite to the angle.
• The adjacent side is the side that is adjacent to the angle. 
• The greatest side is opposite to the greatest angle.
• The smallest side is opposite to the smallest angle.
• you can check the Rotation of axes for further concepts.