iheartfood
Which of the following could be points on the unit circle?
(answer choices attached!)
***CHOOSE ALL THAT APPLY!!!!
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iheartfood
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answer choices A,B,C,D from top to bottom...
im not really sure on this one... pls explain! thanks! :)
***choose ALL that apply :)
iheartfood
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thanks for coming :) do y'all get this one?
mathstudent55
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The equation of the unit circle is x^2 + y^2 = 1
Any point that makes the equation true is a point on the unit circle.
iheartfood
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okay lemme try plugging em in... one sec!
iheartfood
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i tried the first one and it didn't work...... i got 1.34... did i do that right?? so A is WRONG right? :)
iheartfood
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and for the second choice, i got 1.4444444... so that's wrong also right?
iheartfood
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but (1,1) =1 when i plug in so C is an answer right?! :)
mathstudent55
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Try the second one again.
iheartfood
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and for the last one, i got .28... so that's wrong right?? D is NOT an answer right?
mathstudent55
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(1, 1)
x^2 + y^2 = 1
1^2 + 1^2 = 1?
1 + 1 = 1 Not true, so (1, 1) is not a point on the unite circle.
iheartfood
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oh okay i did it again... i got 1 lol so B is an answer yes?
mathstudent55
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You are doing your math wrong.
mathstudent55
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Two work and two don't work.
iheartfood
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ohhh and i see for C... lol my bad!!! :P so A and C are out... and B is an answer?
iheartfood
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and lemme try D again... and D is 1 as well.. my bad.. i entered them all weird in my calc so everything was wrong.. my bad!!! LOL sorry bout that... so B and D are the answers?
mathstudent55
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|dw:1361312285133:dw|
mathstudent55
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|dw:1361312348159:dw|
iheartfood
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i see.. so my answers are B and D then right??
mathstudent55
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C doesn't work. I showed you above.
mathstudent55
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Yes.
iheartfood
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awesome! Thanks :)
mathstudent55
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(0.8)^2 + (-0.6)^2 = 1?
0.64 + 0.36 = 1?
1 = 1
It works.
D is true
mathstudent55
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wlcm