The diagram shows a vertical tower dc on a horizontal ground abc.
abc is a straight line.
the angle of elevation of d from a i'd 28°.
the angle of elevation of d from b is 54°.
ab=25m
calculate the height of the tower.
give your answer in 3 significant figures.
i need working out. plz me.

The measure of ABD=180°- 54°=26°
and then the measure of ADB= x
and x + 26° + 28°= 180°, sum of anlgle in a triagle property
 it means x= 180°- 26-28=126°
application of sinus law in the triangle

sin 28 / BD = sin 126/ AD = sin 26/ 25 so we can deduce that 

AD= 25sin126 / sin26= 46.12
let 's consider the triangle ADC, so for finding h, we have sin 28 = h / AD
and then h = AD x sin28=21.65

Calculate the height of the tower is 21.65

The method to find the female dormitory is 2-d=800