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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.

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

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Yes

Two pairs of adjacent angles are formed when two lines intersect each other.

All angles of a parallelogram are not necessarily congruent. A parallelogram means that the opposite sides run in straight lines that don't intersect. An example is a rectangle or square. Length of sides DO NOT determine if opposite angles are congruent. As long as opposite sides do not intersect each other at any point (if you continue to draw the lines), then the angles diagonal from each other are the same.

Where two straight lines cross the "vertically opposite" angles are equal.

Perpendicular lines intersect to form right angles

Related questions

Yes

yes

Perpendicular is when opposite angles that are formed when two lines intersect and are congruent called?

Whenever two lines intersect, vertical angles refers to the angles opposite each other

Two pairs of adjacent angles are formed when two lines intersect each other.

Draw to lines intersecting each other. The angles across from each other will be both congruent and adjacent

Adjacent angles

The angles that share a vertex and a side of a transversal but no interior points are called vertical angles. Vertical angles are formed when two lines intersect, and they are always congruent.

Vertical angel

Yes.

yes, it makes four right angles.

180 degrees