Find the value of $u$u using a proportion statement.

The two given triangles are similar.

Council has designed plans for a triangular courtyard in the town square.

The drawing shows the courtyard to have dimensions of $4$4 cm, $6$6 cm and $9$9 cm.

The shortest side of the actual courtyard is to be $80$80 meters long.

Use congruence and similarity criteria for triangles to solve problems and to prove relationships in geometric figures.