Circle Relationship Formulas

Front

Central Angle - Arc Measure Relationship

Back

Central Angle Measure =

Intercepted Arc Measure

Front

Inscribed Angle - Arc Measure Relationship

Back

Angle = 1/2 Intercepted Arc

Front

Inscribed Angle (Chord/Tangent) - Intercepted Arc Relationship

Back

Angle = 1/2 Intercepted Arc

Front

Vertex Outside The Circle Arc-Angle Relationship

Back

Angle = 1/2(Large Arc - Small Arc)

Front

Vertex Inside (2 Chords Intersecting)

Arc - Angle Relationship

Back

Angle = 1/2 (Arc #1 + Arc #2)

Front

2 Tangents Segment Relationship

Back

Length of Tangent #1 = Length of Tangent #2

Front

Radius/Diameter drawn to a line tangent to the circle relationship

Back

The radius/diameter will always be perpendicular to the tangent line when drawn to the point of tangency.

Front

2 Secants Segment Relationship

Back

Outside x Whole = Outside x Whole

Front

Secant/Tangent Segment Relationship

Back

Whole^2 = Outside x Whole

Front

2 Chords Segment Relationship

Back

Part #1 x Part #2 = Part #1 x Part #2