Angles Inscribed in a Semicircle Conjecture

The applet below illustrates properties that involve the [b]angles [/b]and[b] arcs[/b] [b]of circles [/b]that must always hold true.[br][br]Notice Segment AB is the diameter of the circle. Move the [b][color=#ff0000]red X[/color][/b] to change the size of the circle.[br]Click on the box by "Angle ACB".[br]Click on the [b]play button[/b] (bottom left corner) to animate the applet.[br][br]Then answer the question that follows.
Angles inscribed in a semi-circle are __________________.
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Information: Angles Inscribed in a Semicircle Conjecture