Question

What is the radius of the circle whose equation is x^2 + y^2 = 8?

Answer 1

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THE ANSWER BE THIS:
`2√(2)`

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Answer 2

2√2

Explanation:

To write the equation of a circle, use the formula
`(x-h)^2+(y-k)^2 = r^2` where the center of the circle is (h, k).

This means the equation is
`x^2 + y^2 = 8` has
`r^2 = 8`. This means the radius is √8 = 2√2.