Horizontal
The length of a perpendicular line drawn from one vertex to the opposite side of a triangle is known as the altitude. It varies depending on the type of triangle and the position of the vertex from which the altitude is drawn. The altitude can be calculated using the area of the triangle and the length of the base to which it is perpendicular. In general, the altitude is crucial for determining the triangle's area and properties.
straight line
Translation.
Construct a scalene triangle and then from each of its vertices draw a straight line that is perpendicular to its opposite side and where these 3 straight lines intersect it is the orthocenter of the triangle. The position of the orthocenter can vary depending on what type of triangle it.
A straight-line kitchen (or single-line kitchen) is a good choice if the working space is limited, yet it can also accommodate large spaces. The neat arrangement of appliances is pleasing to look at. In this type of kitchen, all of the appliances are in a single line. The straight-line kitchen is a simple design and one of the most inexpensive types of kitchen layouts.
vertical
It is a straight line equation.
The straight line with no slope is a point
A kite usually has straight line symmetry. It can be folded in half, and be exactly the same on each side.
With the aid of a Tee square any type of straight line can be produced.
straight line
A straight line forms a one-dimensional image. It has length but no width or height.
180 degrees
True
construction lines
180 degrees -- a straight angle
Translation.