How to find the 3 sides of a triangle when only one is given?

Find the missing factor in exponential form 48^2=3^2 • ?

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.

In the diagram, gef and hef are congruent. what is the value of x