Which of the following could be points on the unit circle?
a. (1/3,2/3)
b. (4/3,4/5)
c. (6/7, sqrt 13/7)
d. (5/13, 12/13)

The correct option is D.

Explanation:

Unit circle is a circle whose radius is 1 unit. The center of a unit circle is origin, i.e., (0,0).

Distance formula:

Find the distance of given points from the origin.

Distance of (1/3,2/3) from the origin is

Distance of (4/3,4/5) from the origin is

Distance of (6/7, sqrt 13/7) from the origin is

Distance of (5/13, 12/13) from the origin is

The distance between (5/13, 12/13) and origin is 1, it means the point (5/13, 12/13) lie on the unit circle. Therefore the correct option is D.

c) troops march forward in close formation against newer, more accurate weapons

not sure but thinking i'ts cause the government was broke. not sure