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What pair of angles are $a$ and $b$ ?

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Alternate exterior angles

Corresponding angles

Alternate interior angles

Vertically opposite angles

answer is C.

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Detailed Solution

Given figure is,
Question Image

In the given figure,

m

and

n

are the straight lines and transversal

l

intersects both the lines

m

and

n .

Therefore, the angle

a

and

b

are alternate angles because of their position, that is, in the opposite side of the transversal and they are both lying on inside of a region covered by line

m

and

n

.
So, they are alternate interior angles.
Hence, the correct option is 3.

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