Stage 18 · Circles

18.4 Point, Line, Circle — Who Touches Whom

Use one unifying key — comparing a distance against the radius — to judge how a point, a line, and two circles sit relative to one another.

4 knowledge points

Knowledge point pages

18.4.1 Point and Circle: Inside, On, or Outside 18.4.2 Line and Circle: Apart, Tangent, or Crossing 18.4.3 How Two Circles Sit Together 18.4.4 How Many Points Fix a Circle

eastmath.com · 18.4 Point, Line, Circle — Who Touches Whom