Which of the following are one-dimensional and have infinite length?
check all that apply.
a. angle
b. segment
c. plane
d. ray
e. point
f. line

A).  No.  Has no length at all.

B).  No.  One-dimensional, yes, but both ends are known, so length is known.

C).  No.  Infinite length, yes, but two-dimensional.

D).  Yes.  One-dimensional.  One end is known, but the other end is infinite.

E).  No.  No dimensions, no length.

F).  Yes.

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