williamgeorgeemeny – Resources – GeoGebra

Alternate segment theorem
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Tangents from a point are equal in length
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The angle between a tangent and a radius is 90 degrees
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The perpendicular...
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Opposite angles in a cyclic quadrilateral add up to 180 degr
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The angle at the centre is twice the angle at...
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Angles in the same segment are equal
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Angles in a semi-circle are 90 degrees
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