# Circle: Central Angles

**Central Angles in a Circle**Central angles AOB and COD are subtended by chords of equal length. How do you think the central angles are related?

**What to do:**Click and drag points A and B to change the length of the chords. Click and drag point C to move the entire triangle COD. What hypothesis can you make about the measure of central angles subtended by chords or arcs of the same length? Click the "Show central angles" checkbox to check your hypothesis.

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