Angle of Elevation: Calculating Height of Statue

[leprofece]

(90) on a column stands a statue of length b. From some point
If the foot of the statue with an angle of elevation x. approaching the observation point a distance to the column, the part looks more high from the same angle increased in betha statue. Demonstrate that (see figure)

from figure I see sinalpha/cos(alpha) (a -acosbetha+bsinbetha) = a sen (betha) -b+bcos(betha)
I think this is that I must demonstrateView attachment 2088

 

[MarkFL]

You mention an angle of elevation $x$, but it is not present in the formula attached. What does $a$ represent?

Please attach a diagram so that we can see what the variables actually represent.

 

[leprofece]

You mention an angle of elevation $x$, but it is not present in the formula attached. What does $a$ represent?

Please attach a diagram so that we can see what the variables actually represent.

Sorry
x is alpha in the formula or image