Trigonometric Ratio Values For Selected Angles Ncert Class 10 The selected angles for which trigonometric ratio values are evaluated are only five in number and are— 00, 300, 450, 600 and 900. these ratio values are mostly used and you have to remember these values. let us take up evaluating the easiest one—for the angle 450. In this chapter, we will study some ratios of the sides of a right triangle with respect to its acute angles, called trigonometric ratios of the angle. we will restrict our discussion to acute angles only. however, these ratios can be extended to other angles also. we will also define the trigonometric ratios for angles of measure 0° and 90°.
Trigonometric Ratio Values For Selected Angles Ncert Class 10 Solution: let us assume a right angled triangle abc, right angled at b. given: 15 cot a = 8. so, cot a = 8 15. we know that, cot function is the equal to the ratio of length of the adjacent side to the opposite side. therefore, cot a = adjacent side opposite side = ab bc = 8 15. let ab be 8k and bc will be 15k. The values of trigonometric ratios for angles 0°, 30°, 45°, 60° and 90°. the value of sin a or cos a never exceeds 1, whereas the value of sec a (0° a < 90°) or cosec a (0° < a 90o) is always greater than or equal to 1. sin2 a cos2 a = 1, sec2 a – tan2 a = 1 for 0° a < 90°, cosec2 a = 1 cot2 a for 0° < a 90o. Solution: ex 8.1 class 10 maths question 4. given 15 cot a = 8, find sin a and sec a. solution: ex 8.1 class 10 maths question 5. given sec θ = 1312 , calculate all other trigonometric ratios. solution: ex 8.1 class 10 maths question 6. if ∠a and ∠b are acute angles such that cos a = cos b, then show that ∠a = ∠b. To study the answers of the ncert questions, click on an exercise or topic below. the chapter is updated according to thenew ncert, for 2023 2024 board exams.get ncert solutions with videos of all questions and examples of chapter 8 class 10 trigonometry. videos of all questions are made with step by step explanations.
Comments are closed.