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引言在平面上给定四个点,连成凸四边形.如果它的两个相对的内角相等(记此角度为α),两条相对的边相等,我们能断定它是平行四边形吗?答案是不一定.
Introduction Given four points in the plane, concatenate into convex quadrilaterals. If its two opposite internal angles are equal (remember the angle is α) and the two opposite edges are equal, can we conclude that it is a parallelogram? The answer is Not necessarily.