Look at their diameter and radius. if they are the same the circles are the same.
1) D. (TRANSITIVE PROPERTY OF CONGRUENCY
2) C. (LINEAR PAIR THEOREM)
3) (D. TRANSITIVE PROPERTY OF CONGRUENCY) to equations (1) and (2), we get m∠IKL + m∠JLD = 180°.
4) C. (CONGRUENT SUPPLEMENTS THEOREM