Angles Subtended From Common Chord

Inscribed angles E and F end at the same chord CD. They are subtended by the chord CD.

Keep the chord CD constant. 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?

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

Keep CD constant. Put E in the upper segment above CD and F in the lower segment below CD. Which two statements are true?

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