Suppose we are given,

two lines & a transversal

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We know that

For parallel lines

  • Corresponding angles are equal
  • Alternate interior angles are equal
  • Interior angles on same side of transversal is supplementary
  • Alternate exterior angles are equal

70.jpg

But the opposite is true as well

  • If corresponding angles are equal,
    Line are parallel

  • If alternate interior angles are equal,
    lines are parallel

  • If sum of interior angles on same side of transversal is 180°,
    lines are parallel.

  • If alternate exterior angles are equal,
    lines are equal.

Let’s do some questions

 

Is l m ?

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View Answer

 

Is l m ?

74.jpg

View Answer

 

Is l ∥ m ?

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View Answer

 

Is l m ?

78.jpg

View Answer

 

Is l m ?

80.jpg

View Answer

 

Is l m ?

82.jpg

View Answer

 

Is l m ?

84.jpg

View Answer

 

Is l ∥ m ?

86.jpg

View Answer

 

Is l m ?

88.jpg

View Answer

 

Is l m ?

90.jpg

View Answer

 

Is l m ?

92.jpg

View Answer

 

Is l m ?

94.jpg

View Answer

 

Is l m ?

96.jpg

View Answer
  1. Chapter 5 Class 7 Lines and Angles
  2. Concept wise
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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.