A line that is at right angles to a vertical line is said to be horizontal.
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Assume you mean the The hypotenuse, which is the line that is not connected by a right angle.
The line that forms a 90 degree angle with any other line is called "perpendicular" or "orthogonal" to the other line.but u can call it right angled
a right angle
There are no degrees in a straight line.The angle between two line segments that looks like a single straight line if you didn't knowwhere the vertex of the angle is, measures 180 degrees, and is called a "straight angle".
It is called the x axis and the vertical number line is the y axis