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How to draw a mathematical vertical line
A point outside this straight line draws a vertical line of this straight line; Another case is that a straight line is known, and a point on the straight line is perpendicular to the straight line. In both cases, tools are needed to draw vertical lines, such as a ruler, a right-angled triangular ruler and a pen. In the first case, put away the ruler first, ruler. ...

A point outside this straight line draws a vertical line of this straight line; Another case is that a straight line is known, and a point on the straight line is perpendicular to the straight line. In both cases, tools are needed to draw vertical lines, such as a ruler, a right-angled triangular ruler and a pen. In the first case, put away the ruler first, ruler. ...