I need help with this two questions

Given: EF is the 1. bisector of CD Prove: EF contains the center of the circle. Statements Reasons EF is the L. bisector of CD Given AC & AD 3. A is on the J. bisector of CD 4 A is on EF to EF contains Substitution. the center of the circle. Reason for line 2 [ Select ] Reason for line 3 [Select ] Question 2 3 pts Find the missing measures. Lines that look tangent, are tangent. m CB = 100 m DB = 110 D mLOBA C mCOB meCAB MACDB m CD I DCB m/OBA = m/COB = m/CAB = m/CDB = marc CD = marc DCB =