摘要
利用仿射几何方法,给出封闭二次曲线内接四边形对角线斜率表达的四边形面积最值的形式,充分揭示封闭二次曲线内接四边形对角线与面积变化的本质联系.
By the method of affine geometry,the expression of the maximum value of closed quadratic curves inscribed quadrilateral area by its diagonal slopes is given.The essential relationship between the products of the diagonal slopes of the closed quadratic curves inscribed quadrilateral and its area changes is revealed.
出处
《河南科学》
2011年第11期1267-1271,共5页
Henan Science
基金
安康学院重点扶持学科(AZXZ0107)
安康学院科研项目(AYQDZR2011)
关键词
解析几何
椭圆
圆
四边形
对角线
斜率
面积
最值
analytic geometry
ellipse
circle
inscribed quadrilateral
diagonal line
slope
area
the peak value
