show that root 20 = 2 root 5. The point A is shown on the unit grid below. The point B is 2 root 5 units from A and lies on the intersection of two grid lines. Write the coordinates of both possible positions for B.

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.