chriseda – Resources – GeoGebra

CT6: Alternate segment theorem
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CT1: Angle at the centre is double the angle at the edge
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CT3: Angles subtended from a chord are equal
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CT5: Tangent to a circle
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CT4: Opposite angles in a cyclic quadrilateral are equal
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CT2: Angle in a semi-circle
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Circle Theorems
Book
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