It is called an apex, and it is mostly used to show the height of a geometric figure.
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A dotted line can be a line of symmetry if it divides a shape into two equal parts that are mirror images of each other. In geometry, a line of symmetry is a line that divides a shape into two congruent parts. Whether a dotted line is a line of symmetry depends on the specific shape and the placement of the line.
There are is not a number of ways, but three are: (1) You could cut it up into square (two perpendicular lines, one coming vertically, the other horizontally. (2) You could do two diagonal lines. (3) You could cut it out into little boots, first do an up-and-down line dividing it into a half, then you could do a dotted line the other way (across/sideways) and then you divide the top half starting form the middle and stopping halfway. After that on both sides you draw two lines coming from the top middle line, going to the other dotted middle line that you drew, and then you bring them to the side. (For example: If it was on the left side, you would make the line left) and then you erase the middle dotted line
A location on a line is often called a point, or a place on the line.
The line that crosses the y-axis is called the intercept.
The line segments that form a polygon called are called sides or edges.