What is the radius of the circle whose equation is x2 + y2 = 8? 2 4 64 Question What is the radius of the circle whose equation is x2 + y2 = 8? 2 4 64 in progress 0 All 6 months 2022-05-14T02:24:02+00:00 2022-05-14T02:24:02+00:00 2 Answers 0

## Answers ( 2 )

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} = 2sqrt{2}[/tex] units

Therefore, the radius of the circle is, [tex]2sqrt{2}[/tex] unitsIt would be

[tex] sqrt{8} [/tex]

Or

[tex] 2sqrt{2} [/tex]