Question

the base edge of a triangular pyramid is 3 meters and its altitude is 10 meters. find the area of a section parallel to the base and 6 meters from it.
4 m below the apex, the area of a section is (4/10)^2 * (base area)

Assuming the base is an equilateral triangle, the base area is
(4.5/2)*sqrt3 = 3.897 m^2

Thus A = 0.6235 m^2
hmmm. what does the base edge means?

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