Posted by Leah on Monday, May 21, 2012 at 12:32pm.
I will assume that by "lateral area" you mean the surface area without the two triangular bases
So if the side of the equilateral triangle is s and the height is h, then the area of the three rectangles is 3sh
new height is (h+1)
so new area = 3s(h+1)
= 3sh + 3s
so the increase is 3s, which is the "perimeter of the base"
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