1 a Show the given information in the diagram using tick marks to show congruent sides and arcs to show congruent angles b Show any other congruent parts you notice from vertical angles sides shared in common or alternate interior angles with parallel lines c Give the postulate or theorem that proves the triangles congruent SSS SAS ASA AAS HL Finally fill in the blanks to complete the proof d Statements 1 2 Given BC DC AC EC Prove ABCA ADCE 3 ABCA ADCE Reasons 1 Given 2 Vertical Zs Theorem 3 B E