# Ex 3.1, 7 - Chapter 3 Class 11 Trigonometric Functions

Last updated at May 29, 2018 by Teachoo

Last updated at May 29, 2018 by Teachoo

Transcript

Ex 3.1, 7 Find the angle in radian though which a pendulum swings if its length is 75 cm and the tip describes an arc of length (i) 10 cm We know that = r Here, = Length of arc = 10 cm r = radius = Length of pendulum = 75 cm We need to find = r 10 = 75 10 75 = = 10 75 radian = 2 15 radian Ex3.1, 7 Find the angle in radian though which a pendulum swings if its length is 75 cm and the tip describes an arc of length (ii) 15 cm We know that = r Here, = Length of arc = 15 cm r = radius = Length of pendulum = 75 cm We need to find = r 15 = 75 15 75 = = 15 75 radian = 1 5 radian Ex3.1, 7 Find the angle in radian though which a pendulum swings if its length is 75 cm and the tip describes an arc of length (iii) 21 cm We know that = r Here, , = Length of arc = 21 cm r = radius = Length of pendulum = 75 cm We need to find = r 21 = 75 21 75 = = 21 75 radian = 7 25 radian

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Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 10 years. He provides courses for Maths and Science at Teachoo.