1. 平行線   hemisphere   parallel lines   plane   hexagon   Hint Half-n-half Clue   2. 区切り、部分   segment   concave   ellipse   perpendicular lines   Half-n-half Clue   3. 卵形   quadrangle   oval   parallelogram   ellipse   Half-n-half Clue   4. 四辺形   segment   quadrilateral   hexagon   convex   Half-n-half Clue   5. 平行四辺形   straight line   quadrilateral   parallelogram   parallel lines   Half-n-half Clue   6. 縁、端　   edge   vertex   concave   polygon   Half-n-half Clue   7. 五角形   pentagon   polygon   perpendicular lines   ray   Half-n-half Clue