Lesson 9.2 • Chord Properties In this lesson you will discover some properties of chords, arcs, and central angles. Investigation 1: Chords and Their Central Angles
Chord Central Angles Conjecture: If two chords in a circle are congruent, then they determine two central angles that are ___________.
Chord Arcs Conjecture: If two chords in a circle are congruent, then their _________________ are congruent.
Prove the statement "If arc ED is congruent to arc CB, then segment ED is congruent to segment CB" Hint: Use the fact that if arcs are congruent, their central angles are congruent. Also, remember, that all radii of a circle are congruent.