Question

Medal!!



Which of the following could not be points on the unit circle?
Check all that apply.

A. (0.8,0.6)
B. (sqrt3/2, 1/3)
C. (1,1)
D. (-2/3, sqrt5/3)

Answer 1

we know that for any point P(x,y) on the unit circle, it must be true that
x^2 + y^2 = 1 .
so you can test this
is it true that .8^2 + .6^2 = 1 ?

Answer 2

yes that is true, .64 + .36 = 1
what about the next one
(sqrt(3)/2) ^2 + ( 1/3)^2

Answer 3

@FearlessRene please don't mention medal even before mentioning your question :) :)
everybody loves medals here but that's not the first priority here :) :P

Answer 4

It seems to get people attention here haha

Answer 5

people's*

Answer 6

:)

Answer 7

second one noo @perl

Answer 8

ok well thank you guys!!