(1) When there are two points that are symmetrical with respect to a line or plane, one is said to be the mirror image of the other. (2) If there is a circle with center O and radius r on a plane, and a point P other than O on the plane is on a half line OQ, and OP×OQ= r2 , then the two points P and Q are said to be in the mirror image position of each other with respect to the circle O. (1) corresponds to (2) where r is infinite. Source : Heibonsha Encyclopedia About MyPedia Information |
(1)一つの直線または平面に関し対称な2点があるとき,一方を他方の鏡像という。(2)平面上に中心O,半径rの円があり,平面上のO以外の点Pが半直線OQ上にあって,OP×OQ=r2であるとき,2点P,Qは円Oに関し互いに鏡像の位置にあるという。(1)は(2)でrが無限大の場合に相当。
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