Series Content LESSON 1 笛卡兒坐標系 | Cartesian Coordinate System LESSON 2 坐標平面上的長度與面積 | Length and Area on a Coordinate Plane LESSON 3 坐標平面上的變換 | Transformation on a Coordinate Plane LESSON 4 極坐標系 | Polar Coordinate System ADD-ON 速算三角形面積 | A Shortcut of Finding the Area of Triangle
