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Standard form of the equation of a circle
(x - h)² + (y - k)² = r², where (h, k) is the center and r is the radius.
diameter is
twice the radius of the circle.
distance formula
√(x₂ - x₁)² + (y₂ - y₁)²
midpoint formula
(x₁ + x₂)/2, (y₁ + y₂)/2.