点てん対たい称しょう

noun

point symmetry

Mathematical term for symmetry about a point, where every part has a matching part at an equal distance from the center but in the opposite direction.

• 点てん対たい称しょうの図ず形けいでは、対たい応おうする点てんを結むすぶ線せん分ぶんは対たい称しょうの中ちゅう心しんで交まじわる。

  In a figure with point symmetry, the line segments connecting corresponding points intersect at the center of symmetry.