Which biconditional is NOT a good definition?
A. A whole number is even if and only if it is divisible by 2.
B. A whole number is odd if and only if the number is not divisible by 2.
C. An angle is straight if and only if its measure is 180.
D. A ray is a bisector of an angle if and only if it splits the angle into two angles.

Question

Which biconditional is NOT a good definition?
A. A whole number is even if and only if it is divisible by 2. 	
  B. A whole number is odd if and only if the number is not divisible by 2. 	
  C. An angle is straight if and only if its measure is 180. 	
  D. A ray is a bisector of an angle if and only if it splits the angle into two angles.

anonymous · Answer

check the "bisector" part
doesn't say anything about the two angles being the same