This excellent educational tool demonstrate how shapes can be arranged into predefined spaces.
Remove any one penta and put it inside the small sectioned off space of the box.
Ry to fit the remaining 16 pentagons within the larger empty frame so that no pieces protrude and there are no empty areas within.

Technical Details

Product Details

Product Dimensions

Package Dimensions
Width : 6.1 inch
Height : 3.5 inch
Length : 11.4 inch

Item Weight: 2.34 pounds (View shipping rates and policies)
Shipping Weight: 2.5 pounds (View shipping rates and policies)

ASIN : B0013A1Z4Q