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Prove the slope criteria for parallel and perpendicular lines and use them to solve geometric problems (e.g., find the equation of a line parallel or perpendicular to a given line that passes through a given point).


A Midpoint Miracle
Unit Squares and Triangles
Triangles inscribed in a circle
Equal Area Triangles on the Same Base I
Equal Area Triangles on the Same Base II
When are two lines perpendicular?
Slope Criterion for Perpendicular Lines
Parallel Lines in the Coordinate Plane