1. वर्णक्रम, आयता   vertex   prism   quadrangle   ellipse   Hint Half-n-half Clue   2. सीधी रेखा   straight line   ellipse   pentagon   convex   Half-n-half Clue   3. चौक   concave   prism   quadrangle   ray   Half-n-half Clue   4. समचतुर्भुज   convex   ellipse   rhombus   heptagon   Half-n-half Clue   5. तल, प्लेन   plane   convex   pyramid   ray   Half-n-half Clue   6. बहुभुज   prism   polygon   edge   quadrangle   Half-n-half Clue   7. सूचीस्तंभ   parallel lines   oval   prism   pyramid   Half-n-half Clue