Question 20
Fill the grid with four shapes (circle, triangle, square, pentagon) and numbers 1,2,3,4 so that every row and every column contains each shape once and each number once. What shape belongs at the question mark? Enter the shape name.

Answer only the shape; the number is not requested. Shapes and numbers each obey their own no-repeat rule.

Answer only the shape; the number is not requested. Shapes and numbers each obey their own no-repeat rule.