Flashcards in Circle Theorems Deck (7)
The angle subtended by an arc at the centre is twice the angle subtended at the circumference
The angles at the circumference subtended by the same arc are equal
The opposite angles in a cyclic quadrilateral add up to 180°.
The angle at the circumference in a semicircle is a right angle.
The angle between a tangent and a radius is 90°.
Tangents which meet at the same point are equal in length.
The perpendicular from the centre of a circle to a chord bisects the chord.