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The angle at the centre is twice the angle at the circumference Angles in the same segement are equal The angle in a semicircle is 90 degrees Oppositeangles in a cyclic quadrilateral add up to 180 degrees The perpendicular from the centre to the chord bisects the chord The angle between a tangent and a radius is 90 degrees Tangents from a pointoutside a circle are equal in length Alternate segment theorem

Circle Theorems Matching Cards - Great Maths Teaching Ideas

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Page 1: Circle Theorems Matching Cards - Great Maths Teaching Ideas

Theangleatthecentre istwicetheangleatthecircumference

Anglesinthesamesegement

areequal

Theangleinasemicircleis90

degrees

Oppositeanglesinacyclic

quadrilateraladdupto180

degrees

Theperpendicularfromthecentretothechord

bisectsthechord

Theanglebetweena

tangentandaradiusis90degrees

Tangentsfromapointoutsideacircleareequal

inlength

Alternatesegmenttheorem

Page 2: Circle Theorems Matching Cards - Great Maths Teaching Ideas