Parallel line and ratio



Problem

In the right figure, l//m//n and AB:BC = 3:4. Find the ratio A'B':B'C'.Let's consider with using parallel line.

Applet

How to use this applet

1.Press "Next" button to go next.
2.Press "Back" button to go back.
3.Drag red point.
4.Press ">" or "<" button to move the line A'C'.
5.Check "Answer" .