Page 101 - Trackpad v5 class 4
P. 101

uiz   Bee        Which block erases everything drawn by the pen?

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                       CONTROLLING A SPRITE


            Scratch allows the user to control the sprite using various blocks. Let us learn more about
            them.


            REPEAT BLOCK

            If you want to repeat a block of code a fixed number of times, the Repeat block is used.
            With the Repeat block, you can draw Polygons. Examples of polygons are triangle, square,
            pentagon, hexagon, heptagon, octagon, nonagon, decagon, etc.

            Look at these polygons that can be made using the repeat block.



                        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

            To draw polygons in Scratch, you must remember three points:

            1.   You must know the number of sides in the shape. This is the value to be given in repeat
               block.

            2.  Each time a repeat command is used, you draw a line and turn at a corner.
            3.  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.



                                                                                    Drawing Shapes in Scratch  99
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