1. segment   plane   heptagon   segment   quadrilateral   Hint Half-n-half Clue   2. losange   ellipse   rhombus   quadrilateral   concave   Half-n-half Clue   3. quadrilatère   concave   straight line   quadrangle   hexagon   Half-n-half Clue   4. ligne droite   segment   perpendicular lines   straight line   plane   Half-n-half Clue   5. Heptagon   oval   rhombus   ray   heptagon   Half-n-half Clue   6. quadrilatère   polygon   quadrilateral   plane   ellipse   Half-n-half Clue   7. lignes parallèles   vertex   oval   polygon   parallel lines   Half-n-half Clue