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Circle Theorems

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1. The angle at the center is twice the angle at the circumference
2. The angle in a semicircle is a right angle
3. Angles in the same segment are equal

Circle Theorems part 2

learn about circle theorems,
1. opposite angles in a cyclic quadrilateral are supplementary
2. the exterior angle formed is equal to the interior opposite angle
3. A radius is perpendicular to the tangent at the point of contact or tangency
4. two tangents drawn from the same external point to a circle are equal
​5. the angle between the tangent and the cord is equal to the interior opposite angle

Circle Theorem CXC Practice

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