Don't Google the Area of an Octagon.
Geometry
Level
pending
If a regular octagonal pyramid has base edge length 4 and height 8, what is the volume?
The answer is 206.01.
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1 solution
Split the octagonal base into a square, which has the side length of a side of the octagon, four congruent rectangles, and four congruent triangles. Find the area of that and multiply it by the height of the pyramid then divide all that by 3.