Acute, obtuse, or 90 degree (right) angles.
Perpendicular is when opposite angles that are formed when two lines intersect and are congruent called?
Two pairs of adjacent angles are formed when two lines intersect each other.
No angles are formed on the inside of parallel lines because they do not intersect. That is the definition of parallel.
Equal angles.
4
Four
complimentary
When lines intersect, angle formed between them is Θ or 180-Θ.
When two lines intersect, the non-adjacent angles formed are called "vertical angles." Vertical angles are congruent, meaning they have equal measures. These angles are located opposite each other at the intersection point of the two lines.
vertical angles
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opposite equal angles