Question

prove theorem 6.6 of ch-lines and angles in class ninth NCERT

Answer 1

heya friend

here is ur answer

Answer 2

GIVEN:- 3 lines (l,m and n)

$let \ l || m \\ let \: m || n$

TO PROVE:-

$l || n$

PROOF:-

Angle 1 = Angle 2 (Corresponding angles)

Angle 2 = Angle 3 (Corresponding angles)

Angle 1 = Angle 3

Since these angles are equal, as well as they form the pair of corresponding angles. Thus, these two lines are parallel .