Posted by Noelle on Thursday, September 4, 2008 at 11:13pm.
The base area equals six times the area of an equilateral triangle with side length 20 cm (since six equilateral triangles make up a hexagon). Multiply that area by the base edge height for the volume.
Add twice the base area to the area of the six 20x16 cm faces to get the area.
hint: equilateral triangle area =
(1/2)*(side length)^2*[sqrt3)/2]
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