Respuesta :
Answer:
The equation of circle of radius r whose centre is the origin (0, 0) ,
It is given by: [tex]x^2+y^2 =r^2[/tex] ......[1]
Given the equation: [tex]x^2+y^2 =8[/tex]
To find the radius of the circle;
Compare the given equation with [1] we have;
[tex]r^2 = 8[/tex]
Taking square root both sides we get;
[tex]r = \sqrt{8} = 2\sqrt{2}[/tex] units
Therefore, the radius of the circle is, [tex]2\sqrt{2}[/tex] units
