A really big square that has no life. It just sits around playing World of Warcraft the whole day.
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A hexagon.
square based prism?
Squares and triangles are out of service.
A regular shape such as a square or rectangle - length times width. If it is an irregular shape, fit known sized squares and triangles within the shape's border and work out area of a square and a triangle times the number of squares and triangles.
Tangrams