Distance between two points - √((x2 - x1)² + (y2 - y1)²), Midpoint of a line segment - ((x1 + x2)/2, (y1 + y2)/2), Slope of a line - (y2 - y1)/(x2 - x1), Origin - (0,0), Point in the first quadrant - (+x, +y), Horizontal line equation - y = constant,

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