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1 知识网络1)球的概念 :球面 ;球体 (简称球 ) ;球半径 ;球直径 .2 )球的截面及性质 :球的截面 ;球心和截面圆心的连线垂直于截面 ;截面圆半径r、球半径R ,以及截面圆心到球心的距离d有关系 :r =R2 -d2 ;大圆 ,小圆 .3)球面距离 :经线、纬线 ;经度、纬度 ;球面距离 .4 )球的体
1 Knowledge Network 1) The concept of a sphere: sphere; sphere (ball for short); sphere radius; sphere diameter. 2) section and nature of the sphere: sphere section; the center of the sphere center and the section circle is perpendicular to the section; radius of the section circle r, the radius of the ball R, and the distance d from the center of the cross section to the center of the sphere: r = R2 - d2; great circle, small circle. 3) spherical distance: warp, weft; longitude, latitude; spherical distance. 4) ball body