A mountain has a base and peak that are inaccessible. A surveyor measure the angle of elevation to the peak as 27.4 degrees. One kilometer close to the mountain, the angle of elevation is 34 degrees. Find the height of the mountain Please help me solve this

In the figure below, ∠dec ≅ ∠dce, ∠b ≅ ∠f, and segment df is congruent to segment bd. point c is the point of intersection between segment ag and segment bd, while point e is the point of intersection between segment ag and segment df. the figure shows a polygon comprised of three triangles, abc, dec, and gfe. prove δabc ≅ δgfe.