Prove this theorem,
Select from the following options for your statements and reasons.
•Ab=cd
•AA
•m<1=mab,m<2=mcd
• altitude is geometric mean
•m<1=m<1
•PA•PC=PA•PD
•Given
•PA•PC=PB•PD
• measure the central angle equals the measure of the arc
•PC=PD
•Subsition
