Question

What is the radius of the circle whose equation is x2 + y2 = 8?
2squard2
64

Answer 1

or 2

Answer 2

the first one

Answer 3

sqrt8 = sqrt(4*2) = 2sqrt2

Answer 4

The equation of the circle is \[(x-a)^2+(y-b)^2=r^2\] where \[(a,b)\] is the center of the circle.

Answer 5

r is the radius.