Question

HELP ME PLEASE !
Which of the following could be points on the unit circle?

Answer 1

The equation for the unit circle is:
\[x^2 + y^2 = 1\]Go through each answer choice and plug the coordinates in to this equation. If it is true, the point works.

Answer 2

@vinnv226 They are all decimals ?

Answer 3

do you know how to find the magnitude of the points?

Answer 4

@zzr0ck3r No i don't :(

Answer 5

you need
\[\sqrt{x^2+y^2}=1\]

Answer 6

so find the one that matches that

Answer 7

do you understand?

Answer 8

@zzr0ck3r Its A for sure but idk if B or C can also be it

Answer 9

this is just the distance from the point to the origin, we need that distance to be 1 because unit circle has radius 1
distance is given bu \[\sqrt{(x-x_0)^2+(y-y_0)^2}\]
but x_0 and y_0 are both 0
so we have
\[\sqrt{x^2+y^2}\]
so you have points that look like (x,y) just plug those into that formula and see if it equals 1

Answer 10

A is wrong

Answer 11

Really I did it with the calculator

Answer 12

So then is it B and D ?

Answer 13

do the math

Answer 14

err I did that wrong but its not A

Answer 15

with a you get\[\sqrt{\frac{4}{9}}=\frac{2}{3}\]

Answer 16

I know A is wrong now but i think B and D are correct am I right

Answer 17

show me....

Answer 18

\[\sqrt{(\frac{4}{3})^2+(\frac{4}{5})^2}=1?\]