You are a grocery store you buy 4 cans of soup for 5 dollars how much would you pay for 6 cans of soup

What is the difference between regular convex and concave polygons

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.

If a || b and e || f , what if the value of y ?