Analysis of mathematics test questions in Xiaoshengchu

The question is how many meters a dog can walk at most.

That is, the dog should tighten the rope and walk in an arc. Because it surrounds a square building with a side length of 6m, the length of the rope is reduced by 6m every 1/4 arc, and the length of the rope is 20m. Divide 20 by 6 and 3 is greater than 2, which means that the dog has to walk 4 1/4 arcs.

Therefore, 3.14 *1/4 * [2 * (20+14+8+2)] = 69.08m.

That is, dogs can walk up to 69 meters.

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