Angles at circumference subtended by the same arc are equal., Angles at circumference subtended by arcs of the same length are equal., Angle at the centre is twice the angle subtended at the circumference by the same arc., The size of an angle at the circumference subtended by an arc is proportional to the arc length., The angles at the centre subtended by the arcs of the same length are equal. The size of an angle at the centre of a circle is proportional to the length of the arc., Angle subtended at the circumference by the diameter of a semicircle is a right angle.,

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