Angle Between a Line and Its Extension

Very Easy Geometry Lines And Angles

In a plane, two lines, Line A and Line B, intersect at point O. At point O, the angle formed between Line A and Line B is $60^ ext{o}$. If Line B is extended, what is the measure of the angle formed between Line A and the extension of Line B?

The angle is $60^ ext{o}$.

The angle is $120^ ext{o}$.

The angle is $180^ ext{o}$.

The angle is $90^ ext{o}$.

Hint

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