Which quadrilateral does NOT have 2 pairs of congruent opposite angles? A. trapezoid
B. square
C. rectangle
D. parallelogram

Find the slope of a line given the following two points

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.

Which geometric principle is used to justify the construction below?