Point F belongs to segment AB. find the length of the segment AF if FB = 5.4 cm, AB = 8.3 cm.

Point F divides segment AB into two segments AF and FB, therefore we get the expression:
AB = AF + FB.
By condition, FB = 5.4 cm, and AB = 8.3 cm.
Substitute the data by the value condition into the expression for the length of the segment AB:
8.3 = AF + 5.4.
Let’s solve the resulting linear equation with one variable.
Let us express AF:
AF = 8.3-5.4;
AF = 2.9 cm.
Answer: AF = 2.9 cm.