What is the circumference of a circle with radius 2.1cm? Use a = 3.14. A. 12.69 cm
B. 8.724 cm
C. 13.188 cm
D. 6.594 cm

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.