Question

What is the radius of the circle whose equation is x2 + y2 = 8? 2 4 64

Answer 1

Answer:

The equation of circle of radius r whose centre is the origin (0, 0) ,

It is given by:    $x^2+y^2 =r^2$                    ......[1]

Given the equation: $x^2+y^2 =8$

To find the radius of the circle;

Compare the given equation with [1] we have;

$r^2 = 8$

Taking square root both sides we get;

$r = \sqrt{8} = 2\sqrt{2}$ units

Therefore, the radius of the circle is, $2\sqrt{2}$ units

Answer 2

It would be
$\sqrt{8}$
Or
$2\sqrt{2}$