9.3 Arcs and Angles 3

Investigation 3: Arcs by Parallel Lines Now you’ll discover a relationship between arcs formed when parallel lines intersect a circle.

Investigate 1. Select each arc and measure its arc angle. Drag point C and observe the arcs and their measurements. Make a conjecture about the arcs intercepted by parallel lines (Parallel Lines Intercepted Arcs Conjecture).

Parallel Lines Intercepted Arcs ConjectureParallel lines intercept ___________ arcs on a circle

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