Question

how draw perpendicular line

Answer 1

line vertical to the surface..

Answer 2

Here is your answer mate ↙️↙️↙️✅✅✅
Draw one of the lines and mark two points on it.

Set a compass to at least half the distance between the two points.

Use the compass to draw a circle centered around each point. The circles should intersect in two points on opposite sides of the line.

Draw a line through the two points of intersection.

Hope this helps you dude ☺️☺️✌️✌️✌️