Write the equivalent decimal to 1/18

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

In the triangles, tr = ge and sr = fe. if = 3.2 ft, which is a possible measure of ? 1.6 ft 3.0 ft 3.2 ft 4.0 ft

What’s the answer ? use the picture to see the problem