Circles glossaryRadius, diameter, circumference & πProof: all circles are similar

Intro to arc measureFinding arc measuresFinding arc measures with equations

Arc length from subtended angleSubtended angle from arc lengthChallenge problems: Arc length 1Challenge problems: Arc length 2

Intro to radiansRadians & degreesDegrees to radiansRadians to degrees

Arc length as fraction of circumferenceArc length from subtended angle: radiansChallenge problems: Arc length (radians) 1Challenge problems: Arc length (radians) 2

Area of a sector

Inscribed anglesChallenge problems: Inscribed anglesInscribed angle theorem proofInscribed angle theorem proof

Proof: Right triangles inscribed in circlesInscribed shapes: find diameterInscribed shapes: angle subtended by diameterInscribed shapes: find inscribed angleChallenge problems: Inscribed shapesInscribed quadrilaterals proofSolving inscribed quadrilateralsProof: radius is perpendicular to a chord it bisectsProof: perpendicular radius bisects chordArea of inscribed equilateral triangle

Proof: Radius is perpendicular to tangent lineDetermining tangent lines: anglesDetermining tangent lines: lengthsProof: Segments tangent to circle from outside point are congruentTangents of circles problem (example 1)Tangents of circles problem (example 2)Tangents of circles problem (example 3)Challenge problems: radius & tangentChallenge problems: circumscribing shapes

Features of a circle from its standard equationGraphing a circle from its standard equationWriting standard equation of a circle

Features of a circle from its expanded equationCircle equation review

Geometric constructions: circle-inscribed squareGeometric constructions: circle-inscribed equilateral triangleGeometric constructions: circle-inscribed regular hexagon

Geometric constructions: triangle-inscribing circleGeometric constructions: triangle-circumscribing circle

Geometric constructions: circle tangentGeometric constructions: circle tangent (example 2)