# Timeline for Names of two circle theorems in English

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Oct 9 '21 at 20:39 comment Corollary: The unlabeled green angle (i.e. the one whose measure is π - θ) is exactly half the unlabeled center reflex angle (i.e. the one whose measure is 2π - 2θ). Therefore, you technically don't need the "above the chord" condition at all. You just need to clarify which of the two central angles you mean (i.e. when the angle is inscribed on the minor arc, you use the reflex angle, when it's inscribed on the major arc, you use the non-reflex angle).
Oct 4 '21 at 11:15 comment Thank you for your help.
Oct 4 '21 at 10:47 history answered