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When are alternate interior angles congruent?
When two parallel lines are both intersected by a tranversal which is a nonvertical line, otherwise all angles formed by that intersection are right angles.
In a coordinate plane two nonvertical lines are what if and only if the product of their slopes is -1?
perpendicular
Do parallel lines go on forever?
No, But 1 Dimensional Does. The lines may or may not go on forever but that has no effect on whether or not a parallel line will cross.
In a coordinate plane two nonvertical lines are WHAT if and only if the product of their slopes is negative one?
Perpendicular
What are lines that never intersect called?
the answer is parallel lines
In a coordinate plane the two nonvertical lines are parallel if and only if they have what slope?
-1 :)
Decide whether the lines given are parallel perpendicular or neither The line through 5 -9 and -8 5 are they parallel perpendicular or neither?
Parallel
When are alternate interior angles congruent?
When two parallel lines are both intersected by a tranversal which is a nonvertical line, otherwise all angles formed by that intersection are right angles.
What is the definition of a slope of parallel lines?
Horizontal lines have a slope of zero, and the slope of vertical lines is undefined. Parallel lines have equal slopes, and perpendicular lines have slopes that are negative reciprocals of each other. So we can say that: Two nonvertical lines are parallel if and only if they have the same slope. Two lines are perpendicular if and only if their slopes are negative reciprocals of each other. That is, if the slopes are m1 and m2, then: m1 = - 1/m2 or (m1)(m2) = -1
In a coordinate plane two nonvertical lines are what if and only if the product of their slopes is -1?
perpendicular
Do parallel lines go on forever?
No, But 1 Dimensional Does. The lines may or may not go on forever but that has no effect on whether or not a parallel line will cross.
In a coordinate plane two nonvertical lines are WHAT if and only if the product of their slopes is negative one?
Perpendicular
If two nonvertical lines intersect what are the slopes?
With the information provided, all that can be said is that the slopes are two different real numbers.
When are two lines nonintersecting?
When two lines are parallel, then they do not intersect.
Are parallel lines actually parallel?
If they were not actually parallel then they would not be parallel lines!
Why does the Parthenon have no parallel lines?
it has parallel lines
Does a rectangle have parallel lines?
no parallel lines
