Given: AD || CB, and MD ~ MB
Prove:AM=CM
A
B
AD || CB
MDA
?
Statement
M
DMA BMC vertical angles theorem
MD ~ MB
given
given
MBC alternate interior angles theorem
AM~CM
AM=CM
?
Reasons
CPCTC
definition of congruence
Which step is missing in the proof?
A. MDA MBC by ASA
B. MDA MBC by SAS
C. MDA MCB by ASA
D. MDA BMC by SAS
