Page 65 - TP_Modular_V2.1_Class5
P. 65

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      63
   60   61   62   63   64   65   66   67   68   69   70