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?

Move E and F to be on top of each other. Keep the chord CD in one place. Move E and F to changes the degrees. Ask the teacher. Move the chord CD. It changes the angles, although they are still the same as each other.

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?

The angles E and F are both 90. The angles E and F are equal. The angles E and F are no longer equal. The angles sum to 180 degrees

Information: Angles Subtended From Common Chord