1. prizma   plane   pyramid   hemisphere   prism   Hint Half-n-half Clue   2. dol'a   straight line   vertex   segment   oval   Half-n-half Clue   3. parallelogram   segment   parallelogram   hemisphere   concave   Half-n-half Clue   4. chetyrehugol'nik   parallelogram   edge   quadrangle   concave   Half-n-half Clue   5. vershina   pyramid   heptagon   convex   vertex   Half-n-half Clue   6. mnogougol'nik   ray   pentagon   segment   polygon   Half-n-half Clue   7. perpendikul'arnyye linii   plane   quadrangle   perpendicular lines   polygon   Half-n-half Clue