Aug
7th
Thu
7th
(-1, 3), (2, 0), (2, -1), (-5, -1)を頂点に持つ凸四角形の面積: (座標）(-1, 3), (2, 0), (2, -1), (-5, -1)を頂点に持つ凸四角形の面積を.. http://tinyurl.com/5q68zr
(-1, 3), (2, 0), (2, -1), (-5, -1)を頂点に持つ凸四角形の面積: (座標）(-1, 3), (2, 0), (2, -1), (-5, -1)を頂点に持つ凸四角形の面積を.. http://tinyurl.com/5q68zr
