How to do the math problem of comparing the length of line segments? Urgent! ! - Training Enrollment Network

How to do the math problem of comparing the length of line segments? Urgent! !

1. There is no shortest line segment AB, and the shortest distance is AB length10cm >; 8 cm

2. Not unique, the sum of the distances from the point on the AB line to A and B is 10cm.

3. Existence, extending AB to C so that BC= 1/2AB, and the sum of the distances from point C to point A and point B is equal to 20cm.

Hope to adopt

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