1. 長円   segment   heptagon   ellipse   plane   Hint Half-n-half Clue   2. 四辺形   hemisphere   quadrilateral   parallelogram   parallel lines   Half-n-half Clue   3. 半球体   polygon   ray   hemisphere   straight line   Half-n-half Clue   4. 七角形   hemisphere   parallel lines   heptagon   oval   Half-n-half Clue   5. 頭頂　   perpendicular lines   quadrilateral   parallel lines   vertex   Half-n-half Clue   6. 菱形, 斜方形　   rhombus   plane   ellipse   convex   Half-n-half Clue   7. 区切り、部分   parallel lines   segment   pentagon   rhombus   Half-n-half Clue