Question

Medal!

A plane is an undefined term because it

can be named using three noncollinear points
is described generally, not using a formal definition
is where other geometric shapes can be constructed
is a flat surface that extends indefinitely in all directions

Answer 1

you can only describe it in general intuitive terms, we can't define a plane exactly

Answer 2

try this experiment, define a plane. you might say flat surface, but then what does 'flat surface' mean?

Answer 3

technically @perl is correct, but for those of us that dont look at the world as indescribable haha, i think the answer is D

Answer 4

i dont like the wording of the problem tho, so it might be wrong

Answer 5

we can't formally define a plane,

Answer 6

at least not in euclidean geometry.

Answer 7

.... this is y I dont understand the problem cause you cant define it

Answer 8

you can formally define a triangle
a triangle has three non collinear points.
but you cant formally define point

Answer 9

thats why it says 'generally '

Answer 10

so im stuck on C and B

Answer 11

" described generally, not using a formal definition" <---- this means, define it generally, suggest ideas . a plane is like a flat surface that extends infinitely.

Answer 12

yeah i would say B or D

Answer 13

my gut says C but my brain says B

Answer 14

a plane is like the surface of a table, this is not a formal definition

Answer 15

i think its B, not C or D because yes those are true about planes, but thats not why theyre indescribable

Answer 16

you can only suggest ideas for it.

same problem with defining point, what is a point? we can only suggest ideas , we draw a dot with a pen

Answer 17

@perl i think youre hurting his head haha

Answer 18

point, line, planes , and space are undefined terms

Answer 19

so it would be B

Answer 20

i think so

Answer 21

I just checked it is B

Answer 22

Its B I got it right

Answer 23

we can only describe generally what a plane is, we can't define it .

you have the same problem in english with a dictionary, you can't define every term or you go in a circle. In a dictionary a definition uses other terms.

When you open a dictionary , you have to 'know' some basic terms, like what a table is, what a cat is , etc