Pearl is preparing a proof for the converse of the triangle proportionality theorem using the image above. she knows that ad over ab equals ae over ac: statement reason 1 ad over ab equals ae over ac given 2 ∡a ≅ ∡a reflexive property 3 δdae ~ δbac side-angle-side (sas) similarity postulate 4 ∡ada ≅ ∡abc corresponding angles of similar triangles are congruent 5 de || bc converse of corresponding angles postulate in which step is her first mistake?