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SAI International School
                                                       CLASS - X

               Mathematics
               CHAPTER-8: Introduction to Trigonometry

               Lesson Notes- 3



               SUBTOPIC :TrigonometicRatios of Complementary Angles


               Trigonometric Ratios of Complementary Angles


               If the sum of two angles is 90° then, they are called Complementary Angles. In a right-
               angled triangle, one angle is 90 °, so the sum of the other two angles is also 90° or they
               are complementary angles.

               In triangle ABC, ∠B = 90 °
               So,   ∠A + ∠C = 90 °

               ∠A &∠C are complementary angles.






























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