1. luch   heptagon   parallelogram   quadrilateral   ray   Hint Half-n-half Clue   2. vypuklyj   convex   vertex   pentagon   heptagon   Half-n-half Clue   3. chetyrehugol'nik   concave   pyramid   quadrangle   ellipse   Half-n-half Clue   4. vognutyj   concave   vertex   pentagon   ellipse   Half-n-half Clue   5. kraj   perpendicular lines   ray   ellipse   edge   Half-n-half Clue   6. vershina   concave   vertex   oval   ellipse   Half-n-half Clue   7. ellips   straight line   polygon   ellipse   edge   Half-n-half Clue