which biconditional is NOT a good definition?

a)two line segments are congruent if and only if they have the same length?

b) a whole number is even if and only if it is divisible by 2?

c)two lines are parallel if and only if they do not intersect

d) three points are collinear if and only they lie on the same line.

something about ray i know this for sure but not sure which one it applies too.. :/

Question

which biconditional is NOT a good definition?



a)two line segments are congruent if and only if they have the same length?

b) a whole number is even if and only if it is divisible by 2?

c)two lines are parallel if and only if they do not intersect

d) three points are collinear if and only they lie on the same line.


something about ray i know this for sure but not sure which one it applies too.. :/

tkhunny · Answer

Do two lines without an intersection NECESSARILY lie in the same plan?