NCERT Grade 10, Chapter 8: Introduction to Trigonometry
Mathematics NCERT Grade 10, Chapter 8: Introduction to Trigonometry: To begin, some real-life examples are given in order to explain the need for trigonometry. In this chapter, students will study the trigonometric ratios of the angles. The discussion of the trigonometric ratios will be restricted to acute angles only.
In section 8.2 various trigonometric ratios are explained i.e ratios of the sides of a right triangle with respect to its acute angles. Solved examples are given to explain how to find trigonometric ratios and how to prove certain given relations.
In the next section, trigonometric ratios of some specific angles 0°, 30°, 45°, 60° and 90° are taught. Table 8.1 contains all the required trigonometric ratios value. Students must learn these values as they are the most important part of this chapter and are essential to solve the problems.
In section 8.4 trigonometric ratios of complementary angles are taught. Exercise 8.3 is based on the same.
The next part of the chapter is about trigonometric identities. Three important identities are highlighted in this section. In the end key points of chapter are discussed.
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