We make a discussion of the projective properties of quadratic curve by using conceptual model of projective geometry.As a result,the third apex's locus of an alterable triangle is offered.There are four points A,B,C and D in a plane and any three points are not collinear.They satisfy the qualification that the locus of the point P(AB,CD) is constant.Five points in a quadratic curve are offered,other points in the quadratic curve are to be sought for.Five tangents of the quadratic curve are offered,other ta...
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