Class 9 Exam  >  Class 9 Notes  >  Mathematics (Maths) Class 9  >  Important Formulas: Lines & Angles

Important Formulas: Lines & Angles | Mathematics (Maths) Class 9 PDF Download

What is angle: An angle is a formed of two rays with a common endpoint. The Common end point is known as the vertex of the angle and the rays as the sides, sometimes as the legs and sometimes the arms of the angle 

Types of angles

  • Acute Angle:  0< θ < 90
    Important Formulas: Lines & Angles | Mathematics (Maths) Class 9
  • Obtuse Angle: 90< θ < 180
    Important Formulas: Lines & Angles | Mathematics (Maths) Class 9
  • Right Angle: θ = 90
    Important Formulas: Lines & Angles | Mathematics (Maths) Class 9
  • Reflex Angle: 180 < θ < 360
    Important Formulas: Lines & Angles | Mathematics (Maths) Class 9
  • Straight Angle: θ =180
    Important Formulas: Lines & Angles | Mathematics (Maths) Class 9

Important Formulas: Lines & Angles | Mathematics (Maths) Class 9Important Formulas: Lines & Angles | Mathematics (Maths) Class 9Important Formulas: Lines & Angles | Mathematics (Maths) Class 9

Angles Rules

Important Formulas: Lines & Angles | Mathematics (Maths) Class 9

If the side of the triangle is produced ,the exterior angle formed is equal to the sum of the opposite interior angle ∠4 + ∠1 + ∠2
Important Formulas: Lines & Angles | Mathematics (Maths) Class 9

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