Picture Tutorial - concentric circles

Activity:
Open the Shape folder below and look at what blocks are available. Notice how we have an Add shape block and then a number of getter blocks (blocks that get information about a shape) and setter blocks (blocks that can change a parameter for a named shape). Most of these blocks and parameters are self explanatory except perhaps the number of sides:
  0, 1, 2 and 10 produce circles
  3, 4, 5, 6, 7, 8 and 9 produce regular polygons with this many sides.

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