II) CIRCLES AND TANGENT LINES
Note: The radius is perpendicular to the Tangent Line at the pointof tangency
Note: Two lines that are perpendicular have slopes that are“Negative Reciprocals” and multiply to -1.
When finding tangents equations to a circle:
Horizontal Tangents: Find both the highest & lowest point of thecircle
Vertical Tangents: Find points furthest to the right & left of thecircle
Tangents (Slanted): Find the slope of the radius to the tangentpoint slope of the tangent line (negative reciprocal)