1. SECANTS Secant - A line that intersects the circle at two points.

2. 2 Secants – On (Inscribed Angle) The angled formed is half the intercepted arc.

3. Two Secants - In If two secants intersect inside the circle, then the measure of the angle formed is 1/2 the sum of the measures of the arcs intercepted by the angle and its vertical angle.

4. Secant/Tangent - On If a secant and a tangent intersect at the point of tangency, then the measure of each angle formed is 1/2 the measure of the intercepted arc.

5. Secant/Tangent, 2 Secants or 2 Tangents - Outside If a secant and a tangent, two secants or two tangents intersect outside the circle, then the measure of the angle formed is 1/2 the positive difference of the measures of the intercepted arcs.