# Q.2. Name the line given in all possible (twelve) ways, choosing only two letters at a time from the four given.

$$\overleftrightarrow {AB}$$ , $$\overleftrightarrow {AC}$$ $$\overleftrightarrow {AD}$$ ,$$\overleftrightarrow {BC}$$ , $$\overleftrightarrow {BD}$$ ,$$\overleftrightarrow {CD}$$ , $$\overleftrightarrow {BA}$$ ,$$\overleftrightarrow {CA}$$ , $$\overleftrightarrow {DA}$$ ,$$\overleftrightarrow {CB}$$ , $$\overleftrightarrow {DB}$$ ,$$\overleftrightarrow {DC}$$ ,