Question

Q25.In the figure if LABC = 40°, ZBCE = LECD = 20° and
LCEF = 160°show that i) AB | CD ii)CD || EF )ABII EF.
Justify your answer.
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Answer 1

Answer:

answer 1:- AB||CD we can see here that

angle ABC=ANGLE BCE +ECD=BCD

ANGLE ABC =ANGLE BCD

SO WE KNow that when two alternate interior anglesare equal than the line are parrallel

AB||CD ,hence proved

2nd:-here

angle CEF AND ANGLE DEF MAKES 180 BY ADDING THEM BOTH

160+20=180

SO WE KNOW THAT WHEN TWO consecutive interior angles make 180 degree so two lines are parrallel CD||EF ,hence proved .

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