Mathematical problems in junior high school about the shortest distance of ants crawling

Solution: (1) Yizhi 1.

3 points

That is, the shortest distance for ants to crawl is 5. Four minutes.

(2) The length of the connection rule is the shortest distance for ants to crawl, and it is set as the radius of the cone bottom and the radius of the side spread (fan).

That's five points

This is an equilateral triangle with six points.

The shortest distance is 7 minutes.

(3) As shown in Figure ③, it is the side development diagram of the cone, and the length of the line segment passing through the point is the shortest distance for ants to crawl. Eight points.

9 points

The shortest distance for ants to crawl is 10 minute.

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