1.

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Answer»

Step-by-step explanation:

Here,

B = 100° ( being Alternate angle )

Also,

b + a = 180 ° ( being co interior angle)

100 + a = 180

a = 80 °

Again,

D = 100° ( being vertically Opposite angle)

Now,

C = B ( being crossponding angle of //)

c = 100°



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