The projection sequence of plane graphs apex and relationship of the sequence and plane faces were discussed in this paper.
Lines pierce the sphere in points.
The point at which a line, or the curve in which a surface, intersects a coordinate plane.
A line or plane perpendicular to a given line or plane.
The angle or inclination of a line or surface that meets another at any angle but90=.
The vertical line meets the horizontal one here.
The distance from the origin to the point at which a line, curve, or surface intersects a coordinate axis.
Two Theorems for the Real Line from the Crossing of Plane and Quadratic Cone and Their Application
Of, relating to, or designating a line and a plane that do not intersect.
The points x and y are where the bedding traces cut the horizontal surface.
Line A crosses line B at right angles.
A 线与B 线成直角相交。
"If the horizontal line does intersect this cure, draw a vertical line from the intersection to the abscissa."
Of, relating to, or designating two or more straight coplanar lines that do not intersect.
The method of handling the hidden lines of raised plane object with two intersecting lines has been presented.
Study on the problem of possition relationships between plane and plane,straight line and straight line and straight line and plane in space;
The line cuts the circle at two points.
Surf-Surf Intersection Curve
A plane curve formed by the intersection of a right circular cone and a plane parallel to an element of the cone.