Question

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Answer 1

Answer:

see

in AOB and COD

angle BAO= DCO (given)

AND

angle BOA=DOC (vertical opposite angle)

Therefore AB //CD

Step-by-step explanation:

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Answer 2

Answer:

AB II CD

Step-by-step explanation:

OC = OD

THIS FORMS ISOSCELES TRIANGLE

OCD = ODC

BAO = OCD

BAO = ODC

ALTERNATE ANGLES ARE EQUAL

LINES ARE PARALLEL