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Question -

In figure, if AB ||CD and CD || EF, find тИаACE.



Answer -

Given: CD || EF

тИа FEC + тИаECD = 180┬░

[Sum of co-interior anglesis supplementary to each other]

=> тИаECD =180┬░ тАУ 130┬░ = 50┬░

Also, BA || CD

=> тИаBAC = тИаACD = 70┬░

[Alternative angles ofparallel lines are equal]

But, тИаACE + тИаECD =70┬░

=> тИаACE =70┬░ тАФ 50┬░ = 20┬░

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