Dimensions:

rectangular small
length: 500mm
width: 500mm
height: 50mm

rectangular big
length: 900mm
width: 900mm
height: 50mm

oval
length: 750mm
width: 400mm
height: 50mm

ngon
length: 800mm
width: 500mm
height: 50mm

ngon
length: 500mm
width: 760mm
height: 50mm

triangle
length: 700mm
width: 600mm
height: 50mm