1. ellipse   ellipse   rhombus   hemisphere   convex   Hint Half-n-half Clue   2. hémisphère   heptagon   hemisphere   perpendicular lines   ellipse   Half-n-half Clue   3. concave   ellipse   concave   segment   parallel lines   Half-n-half Clue   4. lignes parallèles   ellipse   hemisphere   parallel lines   segment   Half-n-half Clue   5. rayon   ray   plane   ellipse   prism   Half-n-half Clue   6. quadrilatère   plane   ellipse   quadrilateral   concave   Half-n-half Clue   7. convexe   pyramid   hemisphere   rhombus   convex   Half-n-half Clue