Question

how to write an equation of the circle with center at the origin and a radius of 11

Answer 1

The standard form equation for a circle at the origin is x^2+y^2=r^2 where r is the radius.
Can you get it now?

Answer 2

x^2+y^2=11^2
x^2+y^2=121

Answer 3

R^2=(x-a)^2+(y-b)^2
(x,y) points of the center
(a,b) any point on the circumference of the circle this is the general equation just put the given information in it i hope this help

Answer 4

R is the radius