Question

In the given figure show that
AB||CD​

Answer 1

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ANGLE DCE + BCE = 30 + 40 = 70

AND, ANGLE CBA = 70

SO ANGLE DCE + BCE = ANGLE CBA

OR, ANGLE DCB = ANGLE CBA

BUT, DCB AND CBA ARE ALTERNATE ANGLES,

SO, AB II CD

Answer 2

In the given figure show that

AB||CD