Included in this package is a complete set of guided notes and answer key for a Circles Unit in Geometry. Lessons include parts of circles (identifying and naming), tangent-radius theorem, two-tangent theorem, radius-chord theorem, angle-arc relationships (including central, inscribed, tangent-chord, chord-chord, secant-secant, secant-tangent, tangent-tangent), graphing circles, writing equations of circles (including completing the square), circumference, area, arc length, and sector area. In