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Only if the angles formed are right angles otherwise they form vertical opposite equal angles

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Q: If two lines intersect to form adjacent angles then the lines are perpendicular?

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yes

If two lines intersect at right angles then they are perpendicular!

Perpendicular lines intersect at right angles to each other.

Perpendicular lines intersect to form right angles.

Perpendicular lines

Related questions

Yes

That is an important theorem in geometry: if two lines intersect to form adjacent congruent angles, then the lines are perpendicular. Those congruent angles would be right angles.

yes

If two lines intersect at right angles then they are perpendicular!

Perpendicular lines intersect at right angles to each other.

Perpendicular lines intersect to form right (90 degree) angles every time.

Perpendicular lines intersect to form right angles.

Perpendicular lines

Perpendicular lines form right angles when they intersect.

Perpendicular lines intersect to form right angles

Lines that intersect right angles (ninety-degree angles) are described as perpendicular.

Perpendicular lines intersect at right angles.