Let a cyclic quadrilateral ABCD. Then the sum of the products of the two pairs of opposite sides equals the product of its two diagonals. In other words the rectangle contained by the diagonals of any cyclic quadrilateral ABCD is equal to the sum of the rectangles contained by the pairs of opposite sides.
Opposite sides paired
Sum of products in measure
Diagonals equal
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Geometry Problems
Quadrilateral
Circle
Ptolemy
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