Three points M N and R lie on one straight line. It is known that MN-15 NK-18cm what can be the segment MR

The problem has 2 ways of solving.

Method 1:

Let point N lie between points R and M, then the length of the segment MR is equal to the sum of the lengths of the segments MN and NR:

МR = МN + NR = 15 + 18 = 33 cm.

Answer: the length of the segment MR is 33 cm.

Method 2:

Let point M lie between points N and R, then the length of the segment MR is equal to the difference between the segments NK and MN:

МR = NR – МN = 18 – 15 = 3 cm.

Answer: the length of the segment MR is 3 cm.