GEOMETRY-CIRCLES

tangents intersect outside of the circle, they are congruent

when a chord is perpendicular and intersects the middle, then it is a bisector.

2chords part x part = part x part

ex : AE x EB= CE x ED

2 secants

external part (whole secant)= ext part(whole secant)

ab(AB+BC)

tangent and secant

tan² =ext part x whole

AB² =BC (BC+CD)

PRACTICE