Use the ends of the line as two center points and draw the arcs which will intersect above the center of the 100mm line. By compass ruler and protractor or by free hand.
The ruler and compass will help you to draw an exact perfect five point star or any star you want.
How to draw a compass star.
There are two ways of drawing a star.
Put the spike of the compass at the bottom of the circle and set the width to the nearest point on the small circle.
In pencil draw two concentric circles with the compass.
Let award winning illustrator shoo rayner show you how five sided stars are constructed geometrically with a compass and a ruler.
Step 4 arcs for star points.
The smaller ones radius should be about a third of the larger ones.
How to draw the heptagaon 7 sided polygon and heptagram 7 pointed star with compass and straight edge.
Next draw a circle along the 16 points followed by another circle inside of that one.
Then use a protractor to mark 16 equidistant points around the circle and draw a straight line through each point.
To draw a compass rose start by drawing a circle with 1 horizontal and 1 vertical line intersecting in the center.
Draw an arc with this radius and mark the points.
Using the protractor draw five lines from the centre in fineliner pen each 72 degrees apart.
To get a star which looks vaguely like this one draw a straight base line of 100mm and then adjust your compass to 85mm.
3 or 5 or 12 simply any.
This method by albrecht durer although not perfect it is a very close approximation.
Perfect stars are easy to draw when you know how.
Once you learn the method i describe here you can draw as many points starts as you wish.
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