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.

Answer 1

straight angle?

Answer 2

That seems like a good definition.

Answer 3

I dont know what a straight angle is....

Answer 4

A straight line... Lol It measures 180

Answer 5

Every one seems good in the forward direction.
Since they all say "if and only if", each one should also work backwards,
Can we correctly say:
If a number is divisible by two, then it is even.
If it is (it is) correct, then it is a correct biconditional.
If not, it is not.

@zzr0ck3r
A straight angle is one that is not bent :), i.e. 180 degrees.

Answer 6

angles dont bent

Answer 7

bend*

Answer 8

lol!

Answer 9

never heard that term...but I get it:)

Answer 10

and yes if a whole number is even then it is divisible by 2

if whole number is divisible by 2 then it is even

Answer 11

I'm still confused... This is supposed to be geometry... not wordplay! Lol

Answer 12

Geometry and logic are closely related.
Geometry proofs need logical thinking, of which Euclid is a master.

Answer 13

was:P

Answer 14

I still don't know the answer....they all seem fine to me.

Answer 15

Good point @mathmate . I guess that's why it's Euclidean geometry.

Answer 16

@zzr0ck3r Thanks. In my mind, his books live on.

Answer 17

touche

Answer 18

he might have figured out time travel, and he is actually here. if anyone could....

Answer 19

I would rather time travel back, then I can show them calculus! lol.

Answer 20

ha, its the last one @Leanybean

Answer 21

"D" is horrible. Never say that!

Answer 22

yeah I read it wrong. the last word is angle...

Answer 23

Anyway, it doesn't read backwards.

Answer 24

Sooo A or B is what I'm thinking...

Answer 25

^^^^ read up

Answer 26

B? Haha sorry I got confused with everyone answering at once :3

Answer 27

For B, the test is:
"If a whole number is not divisible by two, then it's odd".
Does that make sense? If it does, B is not the answer.