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The slope of a line is the tangent of the angle made by the line with the X-axis.

Since for a horizontal line, this angle is 0 and tan(0) = zero, the slope of a horizontal line is zero.

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Q: Why is the slope of a horizontal line zero?
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Related questions

What is the equation of a line with a slope of zero?

A horizontal line has a slope of zero. The equation of a horizontal line is y = a.


Slope of horizontal line?

The slope of a horizontal line is zero.


Why is a slope of a horizontal line zero?

The slope of a line is the tangent of the angle made by the line with the X-axis. Since for a horizontal line, this angle is 0 and tan(0) = zero, the slope of a horizontal line is zero.


Do horizontal lines have an undefined slope?

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


Does a horizontal line has a slope of zero?

Yes, it is true; slope zero is no slope.


A line that has a slope of zero is?

A horizontal line.


What line has a slope of zero?

horizontal line


Some lines have no slope?

A horizontal line has a slope of zero. For a vertical line, the slope is not defined (change of y / change of x would result in a division by zero).A horizontal line has a slope of zero. For a vertical line, the slope is not defined (change of y / change of x would result in a division by zero).A horizontal line has a slope of zero. For a vertical line, the slope is not defined (change of y / change of x would result in a division by zero).A horizontal line has a slope of zero. For a vertical line, the slope is not defined (change of y / change of x would result in a division by zero).


What is a zero slope?

A horizontal line.


Lines always have a slope of zero.?

Horizontal lines always have a slope of zero. (i.e completely flat, level surfaces have a slope of zero). However a line does not have to have a slope of zero in order to be a line.


What is the difference between a line with a slope of zero and no slope?

A line with slope of zero is horizontal. A line with no slope is vertical because slope is undefined on a vertical line.


If the slope of a line is zero What is the slope of the line that is parallel to it?

The parallel line would also have a slope of zero (both are horizontal lines).