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# [[:File:Dividing a circle into arcs and sectors.ggb]]
# [[:File:Dividing a circle into arcs and sectors.ggb]]
# [[:File:Dividing a circle into arcs and sectors - to show ratios.ggb]]
# [[:File:Dividing a circle into arcs and sectors - to show ratios.ggb]]
# [[:File:Introduction to secant and tangent.ggb]]
# [[:File:Circle through 3 points.ggb]]
# [[:File:Circle through 3 points proof.ggb]]
# [[:File:Polygon tending to circle.ggb]]
# [[:File:Tangent is perpendicular to radius.ggb]]
# [[:File:Equal chords and distance from center.ggb]]
# [[:File:Equidistantchords (alternate construction).ggb]]
# [[:File:Chord length and perpendicular distance from centre.ggb]]
# [[:File:Pependicular from center to chord divides the chord.ggb]]
=== Use of Construction Protocol ===
=== Use of Construction Protocol ===