1. losange   parallelogram   ellipse   rhombus   vertex   Hint Half-n-half Clue   2. ellipse   quadrilateral   ellipse   parallelogram   perpendicular lines   Half-n-half Clue   3. ligne droite   straight line   convex   hemisphere   prism   Half-n-half Clue   4. pyramide   ellipse   quadrangle   rhombus   pyramid   Half-n-half Clue   5. lignes perpendiculaires   convex   perpendicular lines   concave   oval   Half-n-half Clue   6. segment   parallel lines   ray   oval   segment   Half-n-half Clue   7. lignes parallèles   perpendicular lines   prism   straight line   parallel lines   Half-n-half Clue