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Mathematics 7 Online
OpenStudy (darkbluechocobo):

Circles help please

OpenStudy (darkbluechocobo):

@ganeshie8

OpenStudy (darkbluechocobo):

OpenStudy (darkbluechocobo):

Hai there ^~^

ganeshie8 (ganeshie8):

the equation is correct !!

OpenStudy (darkbluechocobo):

YAY

ganeshie8 (ganeshie8):

i bet you must be feeling circles are not as difficult as ellipses/hyperbolas :P

OpenStudy (darkbluechocobo):

OpenStudy (darkbluechocobo):

those are next ._. I havent had to deal with them yet

ganeshie8 (ganeshie8):

To write the equation of circle, you need two things : 1) center 2) radius

OpenStudy (darkbluechocobo):

we dont have the radius

ganeshie8 (ganeshie8):

yup ! we need to find the radius by using the given info

ganeshie8 (ganeshie8):

|dw:1397790795583:dw|

ganeshie8 (ganeshie8):

^^thats the circle, and its center.. what do u know about the circle ?

OpenStudy (darkbluechocobo):

well

OpenStudy (darkbluechocobo):

center is -6 and -4

ganeshie8 (ganeshie8):

every point on the circle is at same distance from center, right ?

OpenStudy (darkbluechocobo):

also so the equation we have at the moment is. (x+6)^2+(y+4)^2=r^2

OpenStudy (darkbluechocobo):

Yes I believe so

ganeshie8 (ganeshie8):

Yup ! just find the r and plugin :)

OpenStudy (darkbluechocobo):

How do you do that though >.<

OpenStudy (darkbluechocobo):

is (-2,-1) what do you do with it

ganeshie8 (ganeshie8):

|dw:1397790947006:dw|

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