Falco276 2 years ago HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! The equation of a circle is shown below. (x -5)2 + (y + 2)2 = 64 The radius of the circle is ________ units. (No Multiple Choice)

1. Falco276

@.Sam. @andriod09 @Gin_Ichimaru @ganeshie8 @Hunter15 @Creation @aaronq @lalokio

2. Falco276

@hba @Frostbite @Hero @lexi14 @phi @Meriam

3. phi
4. Falco276

5. Falco276

I'm confused!!!!!!!!!!!!

6. satellite73

\[(x-h)^2+(y-k)^2=r^2\] is the equation of a circle with radius \(r\) and center \((h,k)\)

7. satellite73

in your case \(r^2=64\) what is \(r\) ?

8. Falco276

And how do I translate that into the real equation?

9. Falco276

I actuall don't know what R is. :/

10. satellite73

\[(x-h)^2+(y-k)^2=r^2\\(x-5)^2+(y+2)^2=64\] look almost identical

11. Falco276

okay, so it's 64. Right?

12. satellite73

\(r^2\) is 64 but you are asked for the radius, which is \(r\) what number would you square to get 64?

13. Falco276

8?

14. satellite73

yes

15. Falco276

so that's the answer, right? 8?

16. Falco276

hello? :(

17. satellite73

yes

18. Falco276

okay, thanks. :)

19. satellite73

\(64=8^2\) so \(r=8\) yw

20. Falco276

thanks. :)

21. Falco276

Wait guys, I have another question. segment PR has an endpoint at (25, -5) and a midpoint of (18, -1). What is the value of the x-coordinate of the other endpoint?

22. Falco276

@satellite73 @Loser66 @geoffb

23. Falco276

(this one is also not multiple choice.)

24. Loser66

post at a new post, friend