C2 Maths Coordinate Geometry question help 2

[Fenomenoe9]

Hello can anyone help me in this question please.

Circle C1 has the equation x^2 + y^2 - 2ay=0 where (a) is a positive constant.
a) Find the coordinates of the center and the radius of C1

Answering or just explaning what to do would be appreciated THANKS!

[astarmathsandphysics]

One mo

[astarmathsandphysics]

Hello can anyone help me in this question please.

Circle C1 has the equation x^2 + y^2 - 2ay=0 where (a) is a positive constant.
a) Find the coordinates of the center and the radius of C1

Answering or just explaning what to do would be appreciated THANKS!

a)complete the square
y^2-2ay=(y-a)^2-a^2 so equation becomes x^2+(y-a)^2-a^2=0 so x^2+(y-a)^2=a^2
centre is(0,a) radius is a

[Fenomenoe9]

oh nice thats what i did thought i had to find a also... THanks for your help astar!!!!!

[Fenomenoe9]

By the way was wondering any1 has solomon worksheets>>?? like coordinate geometry worksheet C but i think they cost money right?

[astarmathsandphysics]

There are some solomon worksheets on fep.

[astarmathsandphysics]

Here is the link

http://freeexampapers.com/Dndex.php?d=QSBMZXZlbC9NYXRocy9FZGV4Y2VsL0MyL1NvbG9tb24=

[Fenomenoe9]

lol yeah these are not the ones i want i want the different ones  like specific for example i have the (Coordinate Geometry worksheet C)