1. luch   ray   perpendicular lines   concave   convex   Hint Half-n-half Clue   2. mnogougol'nik   ellipse   straight line   edge   polygon   Half-n-half Clue   3. perpendikul'arnyye linii   edge   quadrangle   perpendicular lines   pyramid   Half-n-half Clue   4. plóskij, róvnyj   straight line   plane   hexagon   polygon   Half-n-half Clue   5. prizma   convex   prism   quadrangle   hemisphere   Half-n-half Clue   6. piramída   pyramid   hexagon   quadrilateral   oval   Half-n-half Clue   7. pr'amaya liniya   parallelogram   straight line   heptagon   parallel lines   Half-n-half Clue