Interactive macro-enabled MS-Excel spreadsheet. Contents: The interior angle sum of a cyclic triangle is 180°. Two radii bound by a chord of a circle form an isosceles triangle. The angle subtended by a diameter of a semicircle is a right angle. The angles subtended by a chord in the same segment are equal. The angle subtended at centre is twice that at the circumference. The sum of two opposite angles of a cyclic quadrilateral is 180°. The angle between a tangent & chord = angle in alternate segment.
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