Inscribed Angle Properties
Move points D, E, and C. What is the relationship between the inscribed angles?
[b]Property[/b]: Inscribed angles that intercept the [color=#ff0000]same or congruent[/color] arcs are [color=#ff0000]congruent[/color].
What kind of segment is [i]CB[/i]?
Diameter
Move point D. What do you notice about the measure of [math]\angle[/math]CDB?
[b]Property[/b]: An angle inscribed in a [color=#ff0000]semi-circle[/color] will always be a [color=#ff0000]right angle[/color].
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Information: Inscribed Angle Properties