anonymous
  • anonymous
I really don't get this lesson question: Which statement is true for the circle? http://learn.flvs.net/webdav/assessment_images/educator_geometry_v14/0800/0800_G8_Q29a.gif Its center is at the ordered pair of 1 over 2, minus 1, and the radius is minus five over two units. Its center is at the ordered pair of minus 1 over 2, 1, and the radius is five over two units. Its center is at the ordered pair of 1 over 2, minus 1, and the radius is five over two units. Its center is at the ordered pair of minus 1 over 2, 1, and the radius is minus five over two units.
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
@amistre64
anonymous
  • anonymous
@jim_thompson5910
mathstudent55
  • mathstudent55
The link doesn't work

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anonymous
  • anonymous
it works on mine
anonymous
  • anonymous
@AccessDenied
anonymous
  • anonymous
This link works for you because it is on a course website and you have to be logged in to view it, do you know how to take a screenshot?
anonymous
  • anonymous
umm i think lemme try
anonymous
  • anonymous
Okay if you need help, reply back with your computer OS(Operating System, Mac or Windows)
anonymous
  • anonymous
Here's the whole thing as pasted from the lesson
1 Attachment
phi
  • phi
a radius is always positive
anonymous
  • anonymous
okay...?
phi
  • phi
that rules out 2 of your choices
anonymous
  • anonymous
so it's either B or C, but I still don't know which
phi
  • phi
the (x,y) pair at the center will make the (x-a)^2 and (y-b)^2 terms zero does that make sense?
anonymous
  • anonymous
not really, no...
phi
  • phi
usually they say (x-h)^2 + (y-k)^2 = r^2 and the center is at (h,k) with radius r
anonymous
  • anonymous
how do we get h and k?
phi
  • phi
so if you see (x- 1/2) that means the x value of the center is +1/2
anonymous
  • anonymous
okay
phi
  • phi
in this case you match your equation to the "generic" one match (x-h)^2 + (y-k)^2 = r^2 (x-1/2)^2 + (y + 1)^2 = 25/4
phi
  • phi
matching y-k to y+1 you have to rewrite y+1 as y - (-1) now you see y - k matches y - (-1) and k is -1
phi
  • phi
or remember that you want the y value that makes (y+1)^2 zero. that would be y= -1
anonymous
  • anonymous
so the Y is -1?
anonymous
  • anonymous
then it's C? Right?
phi
  • phi
yes.
anonymous
  • anonymous
Thank you soooooo much! I'm going to go write you a testimonial! haha
phi
  • phi
thank you

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