Circle theorems
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8 Terms
alternate segment theorem
the angle that lies between a tangent and a chord is equal to the angle subtended by the same chord in the alternate segment
angle at the centre theorem
the angle at the centre is twice the angle at the circumference
angles in the same segment theorem
angles in the same segment are equal
angles in a semi circle
the angle in a semi circle is 90 degrees
chord of a circle
the perpendicular from the centre of a circle to a chord bisects the chord (splits the chord into two equal parts
cyclic quadrilateral
the opposite angles in cyclic quadrilateral total to 180 degrees
tangent of a circle A
the angle between a tangent and a radius is 90 degrees
tangent of a circle B
tangents which meet at the same point are equal in length
