ans this question with explanation
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sorry for my handwriting
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as they are alternate angles ,sum of a+b=180
a=2b
then, 2b+b=180
3b=180
b=180/3
b=60
a=2b=2[60]
=120
a=2b
then, 2b+b=180
3b=180
b=180/3
b=60
a=2b=2[60]
=120
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