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Mr. Blaise has set up a rotating sprinkler on his lawn to water it. However, some areas cannot be reached by the sprinkler. What portion of his lawn will remain dry?

Help the city planner design the new look of city hall. Nested circles, areas, radii — there’s plenty to think about!

After a long day of drawing, Théo puts away his colored crayons and makes an interesting discovery. How many does he have in total?