proove that ab is parallel to ef
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angel ABC= Angel BCD therefore ab||ef
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here ABC = DCE + BCE
65 =30+35
65=65
but these are alternate interior angles
so AB//CD
now CEF + ECD = 180
so as they are consecutive angles EF//CD
so AB// EF
65 =30+35
65=65
but these are alternate interior angles
so AB//CD
now CEF + ECD = 180
so as they are consecutive angles EF//CD
so AB// EF
prove that ab is parallel to ef
done
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