Answer:
B and C cannot be points on the unit circle
Step-by-step explanation:
This like asking which of the points does not satisfy x^2+y^2=1.
Let's look at (-2/3 , sqrt(5)/3)
x=-2/3
y=sqrt(5)/3
We have x^2=4/9 while y^2=5/9, and x^2+y^2=4/9+5/9=9/9=1.
This first one looks great and is on the unit circle.
Let's look at (sqrt(3)/2 , 1/3)
x=sqrt(3)/2
y=1/3
We have x^2=3/4 and y^2=1/9 , and x^2+y^2=3/4+1/9=31/36 (this is not 1).
This point is not on the unit circle.
Let's look at (1,1)
x=1
y=1
We have x^2=1 and y^2=1, and x^2+y^2=1+1=2 (this is not 1).
This point is not on the unit circle.
Let's look at (0.8,-0.6)
x=0.8
y=-0.6
We have x^2=.64 and y^2=.36, and x^2+y^2=.64+.36=1
This point is on the unit circle.
Answer:
B and C
Step-by-step explanation:
FreckledSpots is correct.
