Let the points be defined as  , ,  and . The scalar resolute of is equal to 

The vector makes an angle of with the positive -axis and  with the positive -axis. If   makes an angle of with the positive -axis, then

If   and , the angle between and is

Let be the midpoint of the line joining and . The vector is

If and , then  

The vector u can be expressed in terms of vectors a, b and c as

The position vector of the mid-point and is

How many different vectors are drawn below?

Which of the following subsets of the complex plane is not a circle?

is a