⊥(vertical) is a mathematical symbol, which means vertical, and x ⊥ y means that x is vertical to y; More generally, x and y are orthogonal.

Basic concepts:

Verticality is a basic geometric concept.

⊥ vertical x ⊥ y means that x is vertical to y; More generally, X is orthogonal to Y. If l⊥m and m⊥n, then L || n. The bottom element x = ⊥ indicates that X is the smallest element. x:x^⊥=⊥.

1. Verticality means that one line intersects another line at right angles, and the two lines are perpendicular to each other. Usually, the symbol ⊥ is used to indicate verticality. Verticality is a kind of position tolerance, which evaluates the vertical state between lines, surfaces or surfaces, in which one line or surface is the evaluation benchmark, and one line can be a straight part or a straight motion trajectory of the measured sample.

2. There are two definitions of verticality. Usually, the symbol ⊥. indicates that there are two vectors A and B. The necessary and sufficient condition for a⊥b is that A ⊥ B = 0, that is, (x 1x2+y 1y2)=0. For the verticality problem in solid geometry, it mainly involves the verticality of line and surface, and needs to solve related problems.

3. Vertical Line and Vertical Line When one of the four angles formed by the intersection of two straight lines is a right angle, it is said that the two straight lines are perpendicular to each other, and one of them is called the vertical line of the other straight line. Note that the definition of a vertical line only specifies the size of the intersection angle (90) of two straight lines, but does not specify the position of two straight lines.

4. The slope perpendicular to the slope k obtained from the included angle formula of two straight lines is-1/k ... tan θ = | (k1-k2)/(1+k1k2) | When the vertical θ = 90, there is no slope, that is.