I need help with the image below ASAP

a

Step-by-step explanation:

The standard form of the equation of a circle is

(x - h)² + (y - k)² = r²

where (h, k) are the coordinates of the centre and r is the radius

Here (h, k) = (0, 0), thus

(x - 0)² + (y - 0)² = r², that is

x² + y² = r² → a

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8

step-by-step explanation:

just put √(2) * √(32) into a calculator. that will make the answer be 8.