Had these chromosomes undergone replication before they were separated

The longitudinal halves of a chromosome that has undergone replication are known as chromatids.  They will not be called chromosomes until after they are separated during Mitosis.  Mitosis distribute the chromatids to daughter cells as a cell divides.  The chromosomes are initially replicated in cells undergoing Meiosis, as in preparation for the mitotic division, but then, these chromosomes are divided twice so that four daughter nuclei are produced, each having the haploid chromosome number. 

5.83,-0.10 is 2pi/3

-5.66,-1.41 is just less than 2pi, 7pi/4

-2.83,5.10 is less than 3pi/2, 4pi/3

5,-3 is obviously pi/2

Step-by-step explanation:

Starting point -3,-5 is in 3rd quadrant, slope 5/3.

Angle is zero.

Smallest angle is 5,-3, which is perpendicular to -3,-5, as dot product is zero and slope is -3/5. In 4th quad. angle is pi/2

Next larger angle is 5.83,-0.10, a little more than pi/2 and less than pi; the only such angle is 2pi/3. Also in 4th quad but further around.

None of the vectors are in 1st quad. 3,5 would be angle pi.

Next is -2.83,5.10, in 2nd quad. Slope is -5.1/2.83, steeper than the perpendicular slope 5/3, so angle is less than 1.5 pi. 4pi/3 = 1.33pi, but 5pi/3 = 1.66pi, too big. Only such angle is 4pi/3.

Last is -5.66,-1.41, back in 3rd quad, nearly whole way around. 7pi/4 = 1.75pi