David R.
asked • 05/11/20Write the standard equation of the circle with center (0, 1) passing through point (4, 9).
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1 Expert Answer
The answer is C.
The square of the radius of the circle is the square of the distance between (0,1) and (4,9) which is 42 + 82 = 80.
Therefore the equation is x2 + (y-1)2 = 80.
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David R.
A. x^2 + (y + 1)^2 = 40 B. (x − 1)^2 − y^2 = 80 C. x^2 + (y − 1)^2 = 80 D. (x + 1)^2 + y^2 = 4005/11/20