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Ex 3.1, 7 - Chapter 3 Class 11 Trigonometric Functions
Last updated at August 13, 2026 by Teachoo
Chapter 3 Class 11 Trigonometric Functions
Concept wise
- Radian measure - Conversion
-
Arc length
- Finding Value of trignometric functions, given other functions
- Finding Value of trignometric functions, given angle
- (x + y) formula
- 2x 3x formula - Proving
- 2x 3x formula - Finding value
- cos x + cos y formula
- 2 sin x sin y formula
- Finding Principal solutions
- Finding General Solutions
- Sine and Cosine Formula
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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 Given, r = Radius = Length of pendulum = 75 cm ๐ = Length of arc = 10 cm We need to find ฮธ We know that ฮธ = ๐/๐ ฮธ = 10/75 ฮธ = ๐/๐๐ radian 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 (ii) 15 cm Given, r = Radius = Length of pendulum = 75 cm ๐ = Length of arc = 15 cm We need to find ฮธ We know that ฮธ = ๐/๐ ฮธ = 15/75 ฮธ = ๐/๐ radian 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 (iii) 21 cm Given, r = Radius = Length of pendulum = 75 cm ๐ = Length of arc = 21 cm We need to find ฮธ We know that ฮธ = ๐/๐ ฮธ = 21/75 ฮธ = ๐/๐๐ radian
