This is about triangles, and estimating lengths. In the picture is a proposed walkway around a pond. It states that, you use a 30-60-90 right triangle to estimate the total length of the walkway, then you measure the shortest side of the triangle as 15 meters. But asks what are the lengths of the other two sides, h and b.

And they could be 45.0, 30.0, 17.65, 21.21, 25.98, or 8.82 meters. So I need to know how to figure which is which. Please direct me.