Question

in the figure.
(I)ab||cd
(ii)cd|| ef
(iii)ab|| ef

Answer 1

Yo!
Your Answer.

Correct option

(I) ab || cd

$\bold{explanation}$

°•°<ABC = <DCB

<ABC = <BCE + <ECD

40° = 20° + 20°

40° = 40°

•°•<ABC nd <BCD are alternative interior angles .

And,
We know that alternative angle are only formed b/w two parallel lines.
So,
AB || CD

Answer 2

Answer:

<ABC = <DCB

<ABC = <BCE + <ECD

40° = 20° + 20°

40° = 40°

•°•<ABC nd <BCD are alternative interior angles .

And,

We know that alternative angle are only formed b/w two parallel lines.

So,

AB || CD