Angles Subtended From Common Chord

Inscribed angles E and F end at the same chord CD. They are [color=#ff0000]subtended[/color] by the chord CD.
Keep the chord CD constant.[br][br]Move E and F. Keep them both "above" CD in the same segment. What is true about the angles E and F?
If you want the angles E and F to change degrees, what must you do?
Keep CD constant.[br][br]Put E in the upper segment above CD and F in the lower segment below CD. Which[color=#ff0000] two [/color]statements are true?
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