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
• Obtuse Angle: 90< θ < 180
• Right Angle: θ = 90
• Reflex Angle: 180 < θ < 360
• Straight Angle: θ =180

Angles Rules

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

The document Important Formulas: Lines & Angles | Mathematics (Maths) Class 9 is a part of the Class 9 Course Mathematics (Maths) Class 9.
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## Mathematics (Maths) Class 9

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## Mathematics (Maths) Class 9

48 videos|387 docs|65 tests

### Up next

 Doc | 1 pages
 Test | 25 ques
 Doc | 5 pages
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