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That's the equation of a circle with its center at the origin and a radius of 8.

Q: X2 plus y2 equals 64. what is the radius?

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x2 +y2 = R2 =16 = radius 2 R = 4

X2 + y2 = 100 = r2 r = 10

If that equals 16 then the radius is 4

x2 + y2 = 144 = radius squared radius = sqrt (144) = 12 diameter = 2 x radius = 24

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x2 +y2 = R2 =16 = radius 2 R = 4