Kandinsky Art

Calculate the area of the blue disc with a radius of 2 cm.

[math]8\pi cm^2[/math] another answer [math]4\pi cm^2[/math] [math]2\pi cm^2[/math]

Find the length of the yellow circle with a radius of 2.5 cm.

[math]6,25\pi cm^2[/math] another answer [math]5\pi cm[/math] [math]2,5\pi cm[/math]

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