Which biconditional is NOT a good definition

A. Two angles are supplementary if and only if the sum of their angles measures 180.

B.Two angles are vertical angles only if they are not adjacent to each other and are formed by two intersecting lines.

C.Two angles form linear pair if and only if the angles are adjacent. **

D.The sum of two angles is 90 if and only id those angles are complementary

Question

Which biconditional is NOT a good definition

A. Two angles are supplementary if and only if the sum of their angles measures 180.

B.Two angles are vertical angles only if they are not adjacent to each other and are formed by two intersecting lines.

C.Two angles form linear pair if and only if the angles are adjacent. **

D.The sum of two angles is 90 if and only id those angles are complementary

jim_thompson5910 · Answer

your thoughts?

anonymous · Answer

I chose C.

anonymous · Answer

@jim_thompson5910

anonymous · Answer

sorry my connection is really bad

jim_thompson5910 · Answer

its fine, why C?

anonymous · Answer

because the other three are true and are good definitions

anonymous · Answer

@jim_thompson5910 it keeps on loosing the connection sorry again

jim_thompson5910 · Answer

what makes C a bad definition?

and it's ok, take all the time you need

anonymous · Answer

Because Linear pairs are both supplementary and adjacent? i think thats why @jim_thompson5910

jim_thompson5910 · Answer

you nailed it right on the head and that is what I was looking for

it's missing the part about the "supplementary"

anonymous · Answer

thank you !

jim_thompson5910 · Answer

you're welcome