If l and m are parallel lines in the following image then what is the measure of angle x?

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Since l and m are parallel lines

when two parallel lines are crossed by transverse line then

The pairs of angles on opposite sides of the transversal but inside the two parallel lines are called Alternative interior angles

and are equal to each other.

Therefore,

x+90=125

x=125-90

x=35

so,

Ans is x=35 degree

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