The equation is x² + y² = 169.
What is standard equation of a circle?
The standard equation of a circle with center at (h, k) and radius r is
(x - h)² + (y - k)² = r²
Here, (h, k) is (0, 0) and r = 13
Substitute the values,
x² + y² = 13²
Thus, the equation is x² + y² = 169.
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