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The answer to the last question on page 47 of the first volume of the sixth grade mathematics method guidance series.
Hello, do we want half a catty? Is 6, then the sum of the radii of small circles is 6, so we take the radii of small circles as 1, 2, 3 respectively.
The first way? :? 6*π*2/2? =? 6π
The second way:1* π * 2/2+2 * π * 2/2+3 * π * 2/2 = π+2π+3π = 6π,
So the distance between the two roads is the same.