Radius of the circle x^2+y^2-4x+8y+4 is
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r = 4 units
Step-by-step explanation:
Just FYI
x² + y² - 4x + 8y + 4 = 0
(x² - 4x + 4) + (y² + 2(4)y + 16) - 16 = 0
(x - 2)² + (y + 4)² - 16 = 0 ⇒ r = 4 units
Center of circle is at (2, - 4)
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