Which theorem is it ??
Answer only if you know ಠ益ಠ
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It's one if the Circle Theorems!
They are:
1. Angle at the Center Theorem
2. Angle in a Semicircle (Thales' Theorem)
3. Cyclic Quadrilateral
4. Tangent theorems.
This one, in your case, is a generalised and combined theorem of the 1st and 3rd theorems, also known as the angle subtended by an arc theorem or simply one of the arc theorems.
Hope this helps!
A. Rosea •~•
P.S. I think it would be better if u posted this question under the Maths section.
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