Stage 30 · Analytic Geometry
30.2.1 Angle of Inclination: How Steeply a Line Tilts
30.2 Lines: Direction, Slope, and Equations
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30.2.1 Angle of Inclination: How Steeply a Line Tilts
Core ideaThe angle α a line makes as it tips up off the horizontal axis, running from 0° up to just under 180°, captures its pose.
Module goal. Start from how steep a line is, master slope and the various forms of a line's equation, and learn to write down any line in the coordinate plane.