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1:07
YouTube
Math Expert Annie
Find Angles in a Circle! 🔥 | Triangle in a Circle Explained
When you have a triangle inside a circle (especially if all vertices touch the circle), it's called a cyclic triangle. Important facts: The sum of angles in any triangle = 180°. In a cyclic triangle, opposite angles in a quadrilateral add up to 180°. If one side is the diameter, the angle opposite it is 90°! (This is called the Thales ...
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