Answer:
x²+y²=58
Explanation:
(x-x₁)²+(y-y₁)²=r²
(0,0)=(x₁,y₁) [centre of the circle)
x²+y²=r²
The point (3,7) belongs to the circle.
3²+7²=r²
r²=9+49
r²=58
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