Radius - Half the length of the diameter; from the centre to any point on the circle., Diameter - The longest chord in a circle; passes through the centre., Chord - A line segment connecting two points on the circle but not necessarily through the centre., Tangent - A line segment that touches the circle at exactly one point., Secant - A line that cuts through the circle at two points., Arc - The region between two points on the circumference., Angle at the centre - An angle whose vertex is the centre of the circle and sides are radii., Angle at the circumference - An angle whose vertex is on the circle and sides are chords., Angles subtended by the same arc - These angles are equal in size and stand on the same arc., Angle in a semicircle - This angle always measures 90°.,

Circle Vocabulary and Angle Properties

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