Page 78 - TP-Play_V-2.0_Book-5
P. 78

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. 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 can be made using repeat.


                              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.























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