Which of the following is a correct name for the ray with endpoint D containing B?
A) $\overrightarrow { \mathrm { BD } }$
B) $\overline { \mathrm { DB } }$
C) $\overrightarrow { \mathrm { DB } }$
D) $\overleftrightarrow { \mathrm { DB } }$

Question

Which of the following is a correct name for the ray with endpoint D containing B?  
A) $\overrightarrow { \mathrm { BD } }$ 
B) $\overline { \mathrm { DB } }$ 
C) $\overrightarrow { \mathrm { DB } }$ 
D) $\overleftrightarrow { \mathrm { DB } }$

Quizplus · Accepted Answer

A ray is a line that has only one endpoint, and it extends indefinitely in one direction. The ray with endpoint D containing B can be named as $\overrightarrow { \mathrm { DB } }$ because it starts at point D and extends in the direction of point B. $\overline { \mathrm { DB } }$ would be incorrect because it implies that the line segment includes both points D and B. $\overrightarrow { \mathrm { BD } }$ would be incorrect because it implies that the direction of the ray is from point B to point D, which is not the case. Finally, $\overleftrightarrow { \mathrm { DB } }$ would be incorrect because it represents a line that extends indefinitely in both directions, whereas the given ray extends only in one direction.

Which of the Following Is a Correct Name for the Ray