1. lignes perpendiculaires   heptagon   straight line   perpendicular lines   concave   Hint Half-n-half Clue   2. sommet   parallelogram   hemisphere   vertex   ray   Half-n-half Clue   3. plat   pyramid   straight line   plane   hemisphere   Half-n-half Clue   4. polygone   parallelogram   polygon   ellipse   plane   Half-n-half Clue   5. ligne droite   straight line   edge   plane   rhombus   Half-n-half Clue   6. parallélogramme   pentagon   ray   parallel lines   parallelogram   Half-n-half Clue   7. prisme   prism   quadrilateral   straight line   parallel lines   Half-n-half Clue