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

Important Formulas Lines & Angles - (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

Types of angles

  • Acute Angle:  0< θ < 90
    Types of angles
  • Obtuse Angle: 90< θ < 180
    Types of angles
  • Right Angle: θ = 90
    Types of angles
  • Reflex Angle: 180 < θ < 360
    Types of angles
  • Straight Angle: θ =180
    Types of angles

Types of anglesTypes of anglesTypes of angles

Angles Rules

Types of angles

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
Types of angles

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