Check the Parrallel Line (āϏāĻŽāĻžāĻ¨ā§āϤ⧰āĻžāϞ āϏ⧰āϞ⧰⧇āĻ–āĻž āĻĒā§°ā§€āĻ•ā§āώāĻž āϕ⧰āĻ•) : Solved Examples:


Solved Examples: Checking for Parallel Lines


Example 1 | āωāĻĻāĻžāĻšā§°āĻŖ ā§§


1. In the figure, is line l parallel to line m ? Give reasons.


āϚāĻŋāĻ¤ā§ā§°āϤ l āϏ⧰āϞ⧰⧇āĻ–āĻž m āϏ⧰āϞ⧰⧇āĻ–āĻžā§° āϏāĻŽāĻžāĻ¨ā§āϤ⧰āĻžāϞ āύ⧇āĻ•āĻŋ? āĻ•āĻžā§°āĻŖ āϞāĻŋāĻ–āĻžāĨ¤


Solution | āϏāĻŽāĻžāϧāĻžāύ:


Yes, āĻšāϝāĻŧ, ( l âˆĨ m ).


Reason | āĻ•āĻžā§°āĻŖ: The corresponding angles are equal (110° = 110°). Therefore, the lines are parallel.
āĻ…āύ⧁⧰⧂āĻĒ āϕ⧋āĻŖ (Corresponding Angles) āĻĻ⧁āϟāĻž āϏāĻŽāĻžāύ (110° = 110°)āĨ¤ āϏ⧇āϝāĻŧ⧇, āĻĻ⧁āϝāĻŧā§‹āϟāĻž āϏ⧰āϞ⧰⧇āĻ–āĻž āϏāĻŽāĻžāĻ¨ā§āϤ⧰āĻžāϞāĨ¤


 


2. In the figure, if 1 = 100° and 2 = 80°, are lines p and q parallel ?: āϚāĻŋāĻ¤ā§ā§°āϤ āϝāĻĻāĻŋ ∠1 = 100° āφ⧰⧁ ∠2 = 80° āĻšāϝāĻŧ, āϤ⧇āĻ¨ā§āϤ⧇ p āφ⧰⧁ q āϏ⧰āϞ⧰⧇āĻ–āĻž āϏāĻŽāĻžāĻ¨ā§āϤ⧰āĻžāϞ āύ⧇āĻ•āĻŋ ?


Solution | āϏāĻŽāĻžāϧāĻžāύ:


∠1  + ∠2  = 100° + 80° = 180°


Since the interior angles on the same side are 180°, the lines are parallel. āĻāϕ⧇āϟāĻž āĻĢāĻžāϞ⧰ āĻ…āĻ¨ā§āϤāσāϕ⧋āĻŖā§° āϝ⧋āĻ—āĻĢāϞ 180° āĻšā§‹ā§ąāĻž āĻŦāĻžāĻŦ⧇ (p âˆĨ q)āĨ¤


Ans | āωāĻ¤ā§āϤ⧰: Yes, āĻšāϝāĻŧ,  (p âˆĨ q).