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C2 Maths Coordinate Geometry question help 2

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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:

--- Quote from: Fenomenoe9 on February 15, 2010, 03:56:09 pm ---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!

--- End quote ---
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?

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