1. retas paralelas   plane   quadrangle   parallel lines   perpendicular lines   Hint Half-n-half Clue   2. quadrilátero   ellipse   quadrilateral   vertex   straight line   Half-n-half Clue   3. quadrilátero   rhombus   parallel lines   prism   quadrangle   Half-n-half Clue   4. polígono   perpendicular lines   polygon   quadrangle   vertex   Half-n-half Clue   5. borda   edge   segment   ellipse   hexagon   Half-n-half Clue   6. raio   parallel lines   parallelogram   ray   polygon   Half-n-half Clue   7. convexo   convex   quadrilateral   perpendicular lines   quadrangle   Half-n-half Clue