What is the radius of the circle $x^{2} + y^{2} - 4 x + 8 y + 16 = 0$ ?

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A circle in the xy-plane has equation $(x - 3)^{2} + (y + 2)^{2} = 25$ . What are the coordinates of its center and its radius?
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What is the radius of the… | Egyptian Scholastic Test (EST)