1.

In the figure, show that AB||EF​

Answer»

Step-by-step explanation:

in the figure angle ABC=70 and angle DCB=30+40=70

that means they are equal, when this GOING happen, when they are alternative angles

so AB||CD---Eq1

now same WAY angle DCE=40

and CEF=140 if you ADD these two you will get 180

that means it's SATISFYING the condition that the angles which are same side of TRANSVERSAL line are add up-to 180

so that means CD||EF---Eq2

from eq1 and eq2

we can say that AB||EF


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