For a horizontal line, the slope is zero. Using the formula y=mx+b, where m is the slope.
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A straight line passes through the x-axis one time, if its slope is non-zero, or not at all, if its slope is zero.
A line segment is a straight line that has an endpoint on both sides (look below). ----
A straight, horizontal line.
the formula for slope is y=mx+b, a horizontal line has the slope of zero and the slope of a vertical line can be answered as undefined
A symetrical airfoil is an airfoil that has the same shape on both sides of its centerline and in this type of airfoil : the centerline is thus straight the chord line is the center line the maximum camber is zero the camber ratio is zero