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April 23, 2014

April 23, 2014

Posted by **Leah** on Monday, May 21, 2012 at 12:32pm.

Answer

the perimeter of the base

the area of the base

the height

the area of one lateral face

- geometry -
**Reiny**, Monday, May 21, 2012 at 1:45pmI 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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