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dolphi86 [110]
2 years ago
11

suppose a circle with center (1,-3) passes through point (1,-1). Which equation represents the circle ?

Mathematics
2 answers:
NikAS [45]2 years ago
6 0

Answer:

The answer is C) (x − 1)^2 + (y + 3)^2 = 4

Step-by-step explanation:

The radius is the distance between the center and the point on the circle.

Center: (1, −3); Point: (1, −1)

Distance formula: d =  square root of {(x2 - x1)^2 + (y2 - y1)^2}

r = square root of  {(1 − 1)^2 + (−1 + 3)^2 }

r =  square root of {0 + 4 } = 2

(x − h)^2 + (y − k)^2 = r2 ----> (x − 1)^2 + (y + 3)^2 = 4

Hope this isn't confusing and helps. I also know its right because I just did this on USA Testprep.

horsena [70]2 years ago
4 0

Answer:-4

Step-by-step explanation:

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