Learn all Concepts of Chapter 8 Class 10 (with VIDEOS). Check - Trigonometry - Class 10

Last updated at May 29, 2018 by Teachoo

Transcript

Ex 8.1, 3 If sin A = 3/4 , calculate cos A and tan A. sin A = 3/4 (๐ ๐๐๐ ๐๐๐๐๐ ๐๐ก๐ ๐ก๐ โ ๐ด)/๐ป๐ฆ๐๐๐ก๐๐๐ข๐ ๐ = 3/4 โ ๐ต๐ถ/๐ด๐ถ = 3/4 Let BC = 3x AC = 4x We find AB using Pythagoras Theorem Hence, using Pythagoras theorem (Hypotenuse)2 = (Height)2 + (Base)2 AC2 = AB2 + BC2 (4x)2 = AB2 + (3x)2 16x2 = AB2 + 9x2 16x2 โ 9x2 = AB2 7x2 = AB2 AB2 = 7x2 AB = โ7๐ฅ2 AB = โ7 x Now, we need to find cos A & tan A

About the Author

Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.