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Class 11 maths jee Brilliant Pala class notes - Trignometry
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Master trigonometry with Class 11 Maths JEE Brilliant Pala class notes. Gain comprehensive insights, examples, and techniques to excel in JEE exams. Boost your understanding of trigonometry with this invaluable resource

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  • June 27, 2023
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  • 2021/2022
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TRIGONOMETRY - I




 Angle:




Note : Usually +ve x axis is taken as initial ray




1

,  Measuremnet of angles

1. Sexagesimal system (Drgree)

2. Centesimal system (Grade)

3. Circular system (Radian)

1. Sexagesimal system (Degree)

1 Right angle is divided into 90 equal parts and each part is termed as 1 degree (1°)

1 degree again divided into 60 equal parts, each part is termed as 1 minute (11)

1 minute divided into 60 equal parts, and each part is termed as 1 second (111)
2. Centesimal system: No need to study
3. Circular system (Radian)
1 Radian is the angle subtended by an arc of length equal to the radius of the circle at its centre.Denoted
by 1c or 1 Rad.

 Relation between Radian and degree

c c c c
   
  180 ,
c
 90,  60 ,  45,  30 2c  360
2 3 4 6

 Conversion


Degree  Radian, multiply by
180

180
Radian  deg ree, multiply by


 Arc length :   r  :central angle, should be in radian r : radius




2

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