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Perpendicular lines = Right Angles, thus any right angle related things work, and you know the angle of one of the 3 (90 degrees) so the perpendicular line as a slope of 90 minus the the angle of the undefined:

Since the angles of a triangle must add to 180

Undefined + Perpendicular + Right Angle (90) = 180

Or something like that... been a while since I did geometry... hope this helps

* * * * *

A line with an undefined slope is a vertical line and so a line that is perpendicular to it is a horizontal line. In the coordinate plane, that would be a line with the equation y = c (for some constant c).

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Q: The slope of a line is undefined What is the slope of the line that is perpendicular to it?
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Related questions

What is the slope of a line perpendicular to the x-axis?

slope is infinite.as slope=tan a.here a=90.


Is an undefined slope and a slope of 0 parallel?

No, they are perpendicular.


What is the direction of the line with an undefined slope?

A vertical line has an undefined slope.


A horizontal line has an undefined slope?

No, the slope of a horizontal line is 0. The slope of a vertical line is undefined.


Which formula is correct for the slopes of perpendicular lines?

if slope is given as m then perpendicular slope is -1/m (negative inverse)


Do undefined slopes have a slope?

An undefined slope is just a line straight down. The slope is undefined.


Do horizontal lines have an undefined slope?

No. The slope of a horizontal line is zero. The slope of a vertical line is undefined.


Is an undefined slope a vertical or horizontal line?

An undefined slope is vertical.


What is the slope of a line that is perpendicular?

If the line has a slope of 2, then the perpendicular line has a slope of -1/2. The slope of a perpendicular line is the negative reciprocal. Another example would be if the slope of a line is -1/4, then the slope of the perpendicular is 4.


How can you tell if a slope is zero or undefined?

A slope is 0 if it is a straight horizontal line. A slope is undefined if it is a straight vertical line.


Write an equation for undefined slope?

The equation of a line with an undefined slope is x = a.


What is the difference between a line that has a zero slope and a line that has a undefined slope?

zero is horizontal, undefined is vertical