The amount of rotation about the point of intersection of two planes or lines is called an Angle. It is generally denoted by α,θ, β etc.
Angles are measured in radians, degrees, or gradians.
|Acute Angle||Less than 90 Degree|
|Right Angle||Exactly Equal to 90 Degree|
|Obtuse Angle||Greater than 90 Degree|
|Reflex Angle||Greater than 180 Degree|
|Straight Angle||Exactly equal to 180 Degree|
The Angles measured in an Anticlockwise direction are Positive Angles whereas the angles measured in clockwise direction are Negative Angles. The corner points of an angle is called Vertex.
Degree: It is represented by ‘°’.
1 Minute = 1/60th of degree and 1 Second = 1/60th of minute.
Radian: This is the SI unit of angle and is denoted by ‘rad’. In a circle, there are 2π radians.
i.e. 360 Degree = 2π radian. Therefore, 1 radian = π/180
RD Sharma Solutions for Class 12th maths Measurement of Angles will help you to understand complex concepts involved in measuring any angle in a simplified and organised way. Understand all the concepts involved in Angle Measurement in detail with complete exercise wise solved RD Sharma Solutions for solving different mathematical problems asked in competitive exams like JEE Mains and Advanced easily and accurately.
Chapter 4 Measurement of Angles