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We draw those points: (1,-7) , (-1,-9), and (3,-9) and center (1,-9) We can only draw this circle with that center and going through those points: So draw in three radii: Look at the red radius. it goes from -7 down to -9, that's 2 units Look at the green radius, it's also 2 units long, and the blue one is also 2. So the radius is 2. Edwin