Lessons 30-35 provide information on circles including terminology, properties, and examples. Key properties discussed are: 1) A radius perpendicular to a chord bisects the chord and its reverse. 2) The measure of a central angle is twice an inscribed angle on the same arc. 3) Inscribed angles on the same arc are congruent. 4) A tangent to a circle is perpendicular to the radius at the point of tangency. Several examples are provided to demonstrate applying these circle properties to find unknown angle measures, lengths, centers, and equations of circles.