Type your answer here. Find the radius for a circle with the equation x2 plus y2 equals 9? ..
Radius = 1111
If that equals 16 then the radius is 4
Equation of a circle centre the origin is: x2 + y2 = radius2 ⇒ radius = √9 = 3.
The radius is sqrt(12) = 3.464 (rounded)
That's the equation of a circle with its center at the origin and a radius of 8.
The ' 1 ' in that equation is the radius.
Centre = (0,0), the origin; radius = 11