1. cóncavo   parallelogram   perpendicular lines   pyramid   concave   Hint Half-n-half Clue   2. hexágono   parallelogram   hexagon   edge   convex   Half-n-half Clue   3. convexo   concave   convex   parallelogram   vertex   Half-n-half Clue   4. borde   convex   straight line   edge   quadrilateral   Half-n-half Clue   5. prisma   ray   heptagon   prism   straight line   Half-n-half Clue   6. elipse   ellipse   rhombus   perpendicular lines   oval   Half-n-half Clue   7. hemisferio   parallel lines   rhombus   parallelogram   hemisphere   Half-n-half Clue