Shape A, B and C all have 4 sides and 4 corners, but can you see that Shape D has 5 sides and 5 corners. This is the odd one out. A shape with 5 sides and 5 corners is called a pentagon.

Plus reviews of “Pop! Goes the Nursery Rhyme,” “The Watering Can” and “Girlatee.” ...

As for shapes with seven or more sides, no such polygons tessellate unless they have an angle greater than 180 degrees. Such a polygon is described as concave because it has an indentation.

For more than 100 years, pencils have been putting a hex on American schools. While they come in a variety of shapes, the six-sided, hexagonal pencil is the most popular.

Readers will also learn about tessellating, or tiled, shapes—those that, when repeated and recombined, ... There exist 15.) “The Five Sides of Marjorie Rice” is an absorbing read and a ...