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| The angle subtended at the centre of the circle is twice the angle subtended at the edge. |
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| The angle at the edge of a circle subtended by a diameter is a right angle. |
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| Opposite angles in a cyclic quadrilateral - where all the vertices are an the edge of the circle - add up to 180 degrees. |
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| An angle between a tangent and a chord through the point of contact is equal to the angle in the alternate segment. |
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| Angles in the same segment of a circle subtended from the same chord are equal. |
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| Angles formed from two points on the circumference are equal to other angles, in the same arc, formed from those two points. |
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