That would be a symmetrical line. It means you can fold certain shapes in half and they would be the same exact size.
Triangle: A figure formed by exactly three (non-colinear) points joined by line segments is a triangle. A figure formed by three or more points is generally called a polygon. Of course, if all of the points are co-linear then there is not much of a figure. A polygon has 3 or more sides.
Line Symetry
A line of symmetry, or axis of symmetry.
axis of symmetry
A straight line other than a line segment which does have end points.
Triangle: A figure formed by exactly three (non-colinear) points joined by line segments is a triangle. A figure formed by three or more points is generally called a polygon. Of course, if all of the points are co-linear then there is not much of a figure. A polygon has 3 or more sides.
Line Symetry
A line of symmetry, or axis of symmetry.
axis of symmetry
Is a line of symmetry
No. A tangent touches the circle at exactly one point. A line that intersects a circle at exactly two points is a secant.
It takes exactly 2 distinct points to uniquely define a line, i.e. for any two distinct points, there is a unique line containing them.
line segment
A straight line other than a line segment which does have end points.
between two point there is exactly one line between three points there is exactly one plane
line
In plane geometry there is exactly one straight line through two points. There can be any number of curved lines.