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To draw polygons in Scratch, you must remember a few thumb rules. They are:
You must know the number of sides in the shape. This is the value to be given
in repeat block. For example, you give repeat 3 to draw a triangle and 4 to draw
a square.
Each time a repeat command is used, you draw a line and turn at a corner.
You must know the degree of the angle at the corner for the shape to be
drawn. It is very easy to calculate this. Just divide 360 by the number of sides
in the shape. For example, to draw a triangle, the degree of angle will be 360/3
(sides of the triangle) = 120.
Look at the table given below to make polygons using repeat command.
Polygon Command
Triangle Repeat 3 [Move 100 Steps Turn 120 degrees]
Square Repeat 4 [Move 100 Steps Turn 90 degrees]
Pentagon Repeat 5 [Move 100 Steps Turn 72 degrees]
Hexagon Repeat 6 [Move 100 Steps Turn 60 degrees]
Heptagon Repeat 7 [Move 100 Steps Turn 51 degrees]
Octagon Repeat 8 [Move 100 Steps Turn 45 degrees]
Nonagon Repeat 9 [Move 100 Steps Turn 40 degrees]
Decagon Repeat 10 [Move 100 Steps Turn 36 degrees]
Drawing a Square in Scratch
To draw a square in scratch, arrange the blocks as shown below.
Creating Shapes in Scratch 83

