Geometry › Central angles and arcs

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As you'll see, there are 360 degrees in every circle

CCSS.MATH.CONTENT.HSG.C.A.2
Identify and describe relationships among inscribed angles, radii, and chords. Include the relationship between central, inscribed, and circumscribed angles; inscribed angles on a diameter are right angles; the radius of a circle is perpendicular to the tangent where the radius intersects the circle.

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https://schoolyourself.org/page/lti/sy/geometry/central-angle

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