Name the line given in all possible (twelve) ways, choosing only two letters at a time from the four given.
A line is defined as a straight path that extends infinitely in two directions.
In the given image 4 points are shown A, B, C and D.
∴ The possible ways for naming the line are
←→AB, ←→AC, ←→AD, ←→BC, ←→BD, ←→CD
But we know that we can write a line ←→AB as ←→BA also.
Hence, the possible twelve ways for naming the lines are
←→AB, ←→AC, ←→AD,
←→BC, ←→BD, ←→BA,
←→CD, ←→CA, ←→CB,
←→DA, ←→DB, ←→DC