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Geometry 20 Online
OpenStudy (anonymous):

Which sentence about a geometric plane is false? A. A plane is an undefined term. B. A plane is a one-dimensional figure. C. A plane contains at least three points that do not lie on the same line. D. The intersection of two planes is a line.

OpenStudy (popitree):

A

Mehek (mehek14):

A is not the answer...

Mehek (mehek14):

plane is undefined

OpenStudy (popitree):

b c and D all are correct only plane is a flat surface on which a straight line joining any two points on it would wholly lie.

Mehek (mehek14):

C. A plane contains at least three points that do not lie on the same line. not always true you can have 3 points and all on the same line

OpenStudy (popitree):

For straight line u need at least 2 points

OpenStudy (popitree):

and for plane at least 3 points and they should not lie on the same line the last part is important

Mehek (mehek14):

There are three words in geometry that are not formally defined. These three undefined terms are point, line and plane. In geometry, a point has no dimension (actual size). Even though we represent a point with a dot, the point has no length, width, or thickness. @popitree

OpenStudy (popitree):

formally not defined does not mean undefined.. the thing is u can not have ideal plane with zero height.. same with line or point.. u can not draw/create physically the ideal point plane or straightline

OpenStudy (popitree):

we were arguing unnecessarily.. the correct ans is B

OpenStudy (popitree):

cause PLANE is 2 dimensional

OpenStudy (popitree):

i guess u did not read the options carefully.. and same here

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