geometry!! urgent (math)
posted by Noelle .
The lateral edges of a regular hexagonal pyramid are all 20 cm long, and the base edges are all 16 cm long. To the nearest cc, what is the volume of this pyramid? To the nearest square cm, what is the combined area of the base and six lateral faces?

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]