Introduction to Trignometry – Notes
Trigonometric Ratios and Angles
Trigonometry is the study of relationship between the angles and sides of triangles.
The ratios between the lengths of the sides of a right-angled triangle are relation with its acute angles is called trigonometric ratios.
N a right-angled triangle ABC, if ÐA is an acute angle:
- Sin ÐA
- Tan ÐA
- Cosec ÐA
- Sec ÐA
- Cot ÐA
If we know the value of any one of the trigonometric ratios of an acute angle in a right-angled triangle, we can calculate other trigonometric ratios of the angle.