1. retas paralelas   parallel lines   perpendicular lines   parallelogram   convex   Hint Half-n-half Clue   2. paralelogramo   rhombus   parallelogram   plane   perpendicular lines   Half-n-half Clue   3. reta, linha reta   oval   quadrangle   straight line   pyramid   Half-n-half Clue   4. côncavo   quadrangle   rhombus   concave   straight line   Half-n-half Clue   5. convexo   polygon   plane   convex   parallelogram   Half-n-half Clue   6. segmento   segment   vertex   convex   polygon   Half-n-half Clue   7. pentágono   hemisphere   vertex   straight line   pentagon   Half-n-half Clue