Hidden edges
Because the line goes on forever in both directions.
To write the number 1, start by drawing a straight vertical line from top to bottom. It should be a tall, thin line with no curves or loops. You can also use the numeral "1" to represent the number.
To make a 270-degree angle, start by drawing a line segment horizontally to the right. From the endpoint of this line, use a protractor to measure 270 degrees in the clockwise direction. Mark the point where the 270-degree line intersects, and then draw a line from the original endpoint to this new point. The angle formed between the original line and the new line is a 270-degree angle.
A protractor.
i dont care about math even though i use it.
By drawing the number line and label it.
Measuring stuff or drawing a straight line.
you use a broken line graph usually for showing continuous data (data with growth over time)
So the drawing is a very fine line and easy to rub out?
Because the line goes on forever in both directions.
you don't
Topography
One important element of drawing is understanding and practicing the use of line work. Lines can convey shape, texture, and depth, and mastering different types of lines can greatly enhance the impact of a drawing.
You would use a broken bar graph, when grouping and gathering information. You would use straight, slanted, or vertical lines and showing points with dots. A broken bar graph is just like a line graph.
The line that forms the edge of a figure is an edge line. Which forms the figure the has been drawn. You use this line to define a drawing or a figure.
A single broken yellow line mean when safe to do so that will not interfear with other traffic, go pass the line and pass the vehicle on the left side and use that lane only for passing.
There really is no technique when drawing blind, because you can't see what you draw. The only technique is the one you've mentioned (contour line drawing, which means not including shading).