Question

From a point A, 30 meters from the base of a building B, the angle of elevationto the top of the building C is 56 degrees. The angle of elevation to the top of flagpole D on top of the building is 60 degrees. Find the length of flagpole CD
Did you make a sketch?
I followed your labels and let the base of the building be B
in triangle DAB, tan30 = DB/30
DB = 30tan30° = ...

in triangle CAB, tan 60 = CB/30
CB = 30tan60 = ...

CD = CB - DB = ....

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