Can you plz help me with this

3y + 12 - 27 = 180

In trapezoid bath, ah=19.7 and et=16.1. identify be.

How to do this , and can some one explain

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.