Question

Which biconditional is NOT a good definition?
A. Two line segments are congruent if and only if they are of same length.
B. An angle is straight if and only if its measure is 180.
C. Two figures are congruent if and only if their areas are equal.
D. A whole number is odd if and only if the number is not divisible by 2.

Answer 1

so my opinion is C.