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Say angle 1 is 40 which means that if angle 3 is congruent then angle 3 is also 40 by definition of vertical angles. That would make angle 2 equal to 140 by definition of a linear pair and so angle 4 is congruent by vertical angles.

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Q: What is a counterexample for all intersecting lines form right angles?
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Related questions

What intersecting lines make right angles?

All of them. If its truly intersecting lines, they have to form right angles. All of them. If its truly intersecting lines, they have to form right angles.


What are lines that intersect and form acute and obtuse angles called?

intersecting lines * * * * * Non-perpendicular intersecting lines. Or else the angles would be right angles.


What are lines that intersect to form acute or obtuse angles called?

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Are pluses intersecting lines from right angles?

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What lines are intersecting lines that form right angles when they intersect?

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No, intersecting lines can intersect at any angle.


Can a perpendicular line be a intersecting line?

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How is perpendicular lines similar to intersecting lines?

Perpendicular lines are lines that cross at right angles. Intersecting lines can cross at any angle.


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3 intersecting lines, because none of the three points are right angles.


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yes, these are lines that are intersecting at or forming right angles.