If AB = 15cm, BC = 5cm, the length of AC is ()

If AB = 15cm, BC = 5cm, the length of AC is ()

When C is on the extension line of AB, AC = AB + BC = 20
When C is between a and B, AC = ab-bc = 10

If AB = 15cm, BC = 5cm, then the length of AC is?
The teacher said 10 cm or 20 cm, but I think they may not be in a straight line, but form an angle

Your opinion is right. If a, B and C are in a straight line, the length of AC is 10 cm or 20 cm. If they are not in a straight line, according to the sum of the two sides of the triangle is greater than the third side, and the difference between the two sides is less than the third side, the length of AC should be greater than 10 cm and less than 20 cm

In order to know that there are two points a and B on the line L, and ab = 15cm, point C is also on the line L, and BC = 5cm, find the length of the line AC

When point C is on the extension line of AB, AC = 20
When point C is on line AB, AC = 10