# NCERT Class 10 Mathematics Chapter 8 Introduction to Trigonometry

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## Summary

In this chapter, you have studied the following points:

1. In a right triangle ABC, right-angled at B,

,

.

2. .

3. If one of the trigonometric ratios of an acute angle is known, the remaining trigonometric ratios of the angle can be easily determined.

4. The values of trigonometric ratios for angles

5. The value of sin A or cos A never exceeds 1, whereas the value of sec A or cosec A is always greater than or equal to 1.

6.

7. ,

.