Question

With the help of a bar, the height of trees or buildings can be approximately determined. It stands behind the bar on so that its upper end coincides with the peak of the building. A second or a second measures the horizontal distance between the eyes bar (a), the distance of the bar to the building (b), the distance between the eyes from the ground (d) and the total height (h) of the crossbar.


Place with the variables a, b, c, x is a ratio equation! Start here with x! HELP