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a segment, ray, line, or plane that is perpendicular to a segment at its midpoint
M = [ ( x₂ + x₁) / 2, (y₂ + y₁) / 2 ]
To get your x-coordinate: Add the x's and divide by 2
To get your y-coordinate: Add the y's and divide by 2
d = √[( x₂ - x₁)² + (y₂ - y₁)²]
It does not matter which point is labeled 1 and which is labeled 2
Circumference of a Circle
C=2πr or C=πd
where r = radius and d = diameter and π = pi (approx. 3.14)
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