1. oval'nyj   convex   hemisphere   rhombus   oval   Hint Half-n-half Clue   2. semiugol'nik   heptagon   plane   rhombus   hexagon   Half-n-half Clue   3. perpendikul'arnyye linii   edge   hexagon   prism   perpendicular lines   Half-n-half Clue   4. luch   ray   vertex   quadrangle   parallel lines   Half-n-half Clue   5. parallelogram   rhombus   quadrilateral   parallelogram   convex   Half-n-half Clue   6. kraj   edge   parallel lines   pyramid   rhombus   Half-n-half Clue   7. vognutyj   concave   vertex   ellipse   hemisphere   Half-n-half Clue