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DRAWING POLYGONS IN SCRATCH
Polygons are 2D shapes with three or more straight lines and angles. Examples of
polygons are triangle, square, rectangle, quadrilateral, pentagon, octagon, etc.
To draw polygons in Scratch, you must remember a few thumb rules. They are:
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.
Degree of the angle at the corner
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 turn will be 360/3 (sides of the triangle) = 120.
Look at these polygons that can be made using Repeat.
Polygon Command
Triangle Repeat 3 [Move 100 Steps Turn 120 degrees]
(3 Sides)
Square Repeat 4 [Move 100 Steps Turn 90 degrees]
(4 Sides)
Pentagon Repeat 5 [Move 100 Steps Turn 72 degrees]
(5 Sides)
Hexagon Repeat 6 [Move 100 Steps Turn 60 degrees]
(6 Sides)
Heptagon Repeat 7 [Move 100 Steps Turn 51 degrees]
(7 Sides)
Octagon Repeat 8 [Move 100 Steps Turn 45 degrees]
(8 Sides)
Nonagon Repeat 9 [Move 100 Steps Turn 40 degrees]
(9 Sides)
Decagon Repeat 10 [Move 100 Steps Turn 36 degrees]
(10 Sides)
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