Q. 75.0( 1 Vote )

For what value of x will l1 and l2 be parallel lines.

i.

ii.

Answer :

(i) Given: l1||l2


1 = (2x + 20)° and 2 = (3x-10)°


Corresponding angles are equal


1 = 2


(2x + 20)° = (3x-10)°


x = 30°


ii. Given: l1||l2


1 = (2x)° and 2 = (3x + 20)°


Co-interior angles are supplementary


1 + 2 = 180°


(2x)° + (3x + 20)° = 180°


5x = 160°


x = 32°


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