Three points B, C and C lie on one straight line, BC = 172cm, DC = 25cm. How long can BC be?

Let us assume that the extreme points of the line are B and C.

In this case, point D will lie between them.

In order to determine the length BD, it is necessary to subtract the value of the length DC from the length BC.

We get:

172 – 25 = 147 cm.

Suppose that the endpoints of the line are D and B.

In this case, point C will lie between them.

So the length BD will be:

172 + 25 = 197 cm.

Answer: The length of the segment DB can be equal to 147 or 197 cm.