On the segment AB 23 cm long, points C and D were marked so that AC = 15 cm, DB = 12 cm.

On the segment AB 23 cm long, points C and D were marked so that AC = 15 cm, DB = 12 cm. What is the length of the segment CD?

We are given a segment AB, which is 23 cm. 2 points were placed on it.

1) BC = AB – AD;

BC = 23 – 15 = 8 cm;

2) AD = AB – DB;

AD = 23 – 12 = 11 cm

3) СD = AB – AD – CB;

СD = 23 – 11 – 8 = 4 cm.

Answer: segment CD = 4 cm.