Using Properties of Parallel Lines/

When do we need to put converse at the end?

When they're asking why the lines are parallel
The two theorems that have no names

If two lines are parallel to the same line, then they are parallel to each other

If two lines are perpendicular to the same line then they are perpendicular to each other
When all right anles are congruent to each other

Right Angle Theorem
They always have the same slope

Parallel Lines
Has a slope of zero

Horizontal Lines
Have an Undefined Slope

Vertical Lines
Lines goes up to the left

Negative Slope
Line goes up to the right

Positive Slope
measures how steep the line is

Slope
Formula for Slope?

y2-y1

x₂-x₁
When is it an undefined slope?

When the zero is the numerator
In a coordinate plane, 2 non-vertical lines are perpendicular if and only if the product of their slopes is -1.
(when the slopes are opposite reciprocals)

Slopes of Perpendicular Postulate
What lines are perpendicular?

Horizontal and Vertical Lines

Author

LaurenCamp29

179950

Card Set

Using Properties of Parallel Lines/

Description

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Updated

2012-10-25T23:00:00Z

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