The sum of the radii of the two circles is 3 decimeters. It is known that the perimeter of the big circle is 12.56, so what is the radius of the small circle?

The circumference of the great circle is 12.56
So the radius of the big circle is 12.56 △ 3.14 △ 2 = 2 (decimeter)
Radius of small circle = 3-2 = 1 (decimeter)
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