In a race, if my time beat your time by 12 fewer seconds than my time beat pat's time, then your time beat pat's time by
a) 6 seconds
b) 12 seconds
c) 18 seconds
d) 24 seconds

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.