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you line up the dots of the segment to the dots of the protcractor and draw/measure the angles.
U Draw a diagonal line then another the opposite way...some people just use dots.
The fixed point that is located in the center of a circle and is used as the guiding point to draw it is called the "point of origin".
Louis Braille (as he was called) created a system where each letter of the alphabet was represented by a number of (maximum: 6) dots. For making those dots he originally used a stitching awl.
I looked up and I think you use them to draw graphs but can use them to draw straight lines.