Type your answer here. Find the radius for a circle with the equation x2 plus y2 equals 9? ..
7
4
3
5. A circle with centre (0,0) has equation: x2 + y2 = radius2 With: x2 + y2 = 25 = 52 The radius is 5.
x2 +y2 = R2 =16 = radius 2 R = 4
X2 + y2 = 100 = r2 r = 10
Equation of a circle centre the origin is: x2 + y2 = radius2 ⇒ radius = √9 = 3.
I think you have missed out an equals sign. If you mean x2 + y2 = 16, then the radius is 4.
If this is the equation of a circle, the answer is 11, except that there needs to be a plus sigb between the x2 and the y2
9
7