Hello, norifurippu!

We don't need the lengths ofIn the figure, the segments and are parallel.

What is the value of ?Code:* | * 8 m1 | * | * 9 * - - - - - - - * - - - - - - - - - * x * | * | m2 2x * | * | *m1andm2.

Since , the two triangles are similar.

Hence: .