It is known that line AB = 20cm, there is a point C on line AB, and BC = 10cm, M is the key point of line AC, and the length of line am is calculated To write the solution: Because so

M is the key point of line AC, right?
If so
You draw a graph yourself. A point C on AB, ab = 20, BC = 10. Obviously, C is the midpoint of ab
M is the midpoint of AC, am is a quarter of AB, which is equal to 5

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