Question

the notation below represents which of the following?
↔
ab
a. plane ab
b. ray ab
c. line ab
d. line segment ab

Explanation:

• A plane is a flat, two - dimensional surface, and the notation $\overleftrightarrow{AB}$ is not used to represent a plane. So option A is incorrect.
• A ray is represented with a single arrow, for example, $\overrightarrow{AB}$ (starting at A and going through B) or $\overleftarrow{AB}$ (starting at B and going through A). The double - arrow notation is not for a ray, so option B is incorrect.
• A line is represented with a double - arrow notation above the two points, like $\overleftrightarrow{AB}$, which means the line that passes through points A and B and extends infinitely in both directions.
• A line segment is represented with a bar without arrows, like $\overline{AB}$, so option D is incorrect.

Answer:

C. Line AB