1. convex   segmento   plano   convexo   prisma   Hint Half-n-half Clue   2. segment   segmento   hemisfério   borda   prisma   Half-n-half Clue   3. straight line   vértice   borda   paralelogramo   reta, linha reta   Half-n-half Clue   4. plane   vértice   prisma   quadrilátero   plano   Half-n-half Clue   5. prism   pirâmide   oval   prisma   elipse   Half-n-half Clue   6. parallelogram   borda   raio   côncavo   paralelogramo   Half-n-half Clue   7. perpendicular lines   prisma   losango, rombo   retas perpendiculares   elipse   Half-n-half Clue