Question

Which of the following statements are true?
(i) A line segment has no definite length.
(ii) A ray has no end-point.
(iii) A line has a definite length.
(iv) A line $\overleftrightarrow{AB}$ is same as line $\overleftrightarrow{BA}$.
(v) A ray $\underset{AB}{\to }$ is same as ray $\underset{BA}{\to }$.
(vi) Two distinct points always determine a unique line.
(vii) Three lines are concurrent if they have a common point.
(viii) Two distinct lines cannot have more than one point in common.
(ix) Two intersecting lines cannot be both parallel to the same line.
(x) Open half-line OA is same as ray $\underset{OA}{\to }$.
(xi) Two lines may intersect at two points.
(xii) Two lines l and m are parallel only when they have no point in common.

Answer 1

(i) False. A line segment has a definite length.

(ii) False. A ray has one end-point.

(iii) False. A line has no definite length.

(iv) True

(v) False. $\overleftrightarrow{BA}$ and $\overleftrightarrow{AB}$ have different end-points.
(vi) True

(vii) True

(viii) True

(ix) True

(x) True

(xi) False. Two lines intersect at only one point.

(xii) True