## hba 3 years ago Equation of a circle with ends of diameter at (-3,2) and (5,-6) is :

1. hba

2. hartnn

that is simple.

3. hartnn

mid-point is centre

4. waterineyes

Find the distance between and divide it by 2 to find radius..

5. hartnn

distance between the two points = diameter =2r

6. waterineyes

Do you know how to find midpoint or not??

7. hba

I know nothing lol but i am going to give you a tutorial on Conic section soon promise :D

8. hba

@waterineyes noooooooo

9. hartnn

u don't know how to find mid-point ? thats news... just take the average of co-ordinates.

10. hba

x+y/2 but x1 or x2

11. hartnn

for x-coordinate of midpoint, u take average of x-coordinates of endpoints

12. hartnn

(-3+5)/2

13. waterineyes

Sorry net stopped working..

14. waterineyes

And I think your mind too.. @hba

15. waterineyes

$Midpoint(x,y) = (\frac{x_1 +x_2}{2}, \frac{y_1+y_2}{2})$

16. hba

@waterineyes Yeah right lol and [Math processing error ] Anyways @hartnn I remember (x,y)=(x1+x2/2,y1+y2/2)

17. hba

@waterineyes I cannot see latex

18. hartnn

so whats the midpoint ? centre

19. hba

(x,y)=(1,-2)

20. hartnn

thats correct centre

21. hartnn

22. waterineyes

23. hba

So i use the old radius formula ?

24. hba

$r=\sqrt{g^2+f^2-c}$

25. hba

@waterineyes @hartnn Do you have a better way ?

26. hartnn

not that, can u find distance between two points ?

27. waterineyes

What are you doing man?? Use distance formula..

28. hba

Yeah

29. hartnn

Distance between points (x1,y1) and (x2,y2) is $$\huge d=\sqrt{(x_1-x_2)^2+(y_1-y_2)^2}$$

30. waterineyes

$Distance = \sqrt{(x_2-x_1)^2 - (y_2-y_1)^2}$

31. hba

$d=\sqrt{(x2-x1)^2+(y2-y1)^2}$

32. hba

lol

33. waterineyes

Written three times but used not atleast once.. ha ha ha..

34. hartnn

lol :P

35. hba

$d=8\sqrt{2}$

36. hba

what next ?

37. hartnn

38. hba

@hartnn ?

39. hartnn

commented

40. waterineyes

This you have got is length of Diameter.. You have to find radius so you will half it..

41. hba

r=4root(2)

42. hartnn

yup... u know what to do from now....

43. waterineyes

|dw:1353175013593:dw|

44. hba

(x-a)^2+(y-b)^2=r^2

45. waterineyes

46. hba

x^2+y^2-2x+4y-27=0

47. waterineyes

Yep..

48. waterineyes

1 + 4 = 32 implies -27 on LHS..

49. hba

Thanks a lot @hartnn and @waterineyes

50. waterineyes

You are welcome dear..