A line has endpoint. 

Name the collinear point to $\mathrm{B} \mathrm{and} \mathrm{C}.$

In the adjoining figure, $\mathrm{AB} \mathrm{and} \mathrm{EF}$ intersect at which point.

Identify the below figure as (Open curve/Closed curve):

Identify the below figure as (Open curve/Closed curve):

Identify the below figure as (Open curve/Closed curve):

Study the figure and write the following. $\left(\mathrm{OF}/\mathrm{OE}/\mathrm{OD}\right)$
Common arm