Posted by acshikari on Tuesday, September 20, 2011 at 7:16am.
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.

math  drwls, Tuesday, September 20, 2011 at 8:16am
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

math  acshikati, Friday, September 23, 2011 at 12:20am
hmmm. what does the base edge means?
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