**Guide :Middle School **

# What is the general form of the equation for the given circle centered at O(0, 0)?

What is the general form of the equation for the given circle centered at O(0, 0)?**General form of equation of circle (1),(x-h)²+(y-k)²=r²....(1)h=-f=0k=-g=0Cause centre is (-f,-g)or (h,k)here centre is (0,0)where r is the radius of the circle,So the general form of equation o f a circle having centre (0,0) is ,x²+y²=r²or,x²+y²-r²=0**...