Question

What is the radius of the circle whose equation is x2 + y2 = 8
a.2 sqrt2
b.4
c.64

Answer 1

Formula of a circle with the center at the origin is \(x^2+y^2=r^2\) where \(r\) is the radius. What value of \(r\) satisfies \(r^2 = 8\)?

Answer 2

so \[x^2+y^2=8^2\]

Answer 3

so its 64 right?

Answer 4

does 64 * 64 = 8?

Answer 5

The radius squared = 8. Alternatively, the radius = the square root of 8. You still like 64 as your answer?