The most common tool used to draw straight lines is the age old ruler. If you don't have a ruler you can also substitute it with any straight edge found nearby.
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You can draw straight lines with the help of a ruler or anything with a straight edge.
cant do that here, but construction number one at this link will help you figure it out. http://whistleralley.com/construction/reference.htm
A protractor can help you do this. It has a bar that swings and can measure certain angles.
if you think of the horizon which goes from left to right then that will help you draw a horizontal line.a ruler is also good for making the line strait line, haha lol
if you are drawing a circle with the help of circle tool in computer with paint, you will find that if you zoom it,the circle is made with small lines.