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A triangular pyramid has a slant height of 0.75 foot. The equilateral triangular base has a perimeter of 1.2 feet and an area of about 0.07 square foot. Find the approximate surface area.

Guest Apr 7, 2017
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Assuming that we're not interested in the area of the base.......

 

The faces of the pyramid are 3 triangles each having a base of 1.2 / 3  = .4 ft

 

So......the surface area =

 

3 * (1/2) (base of each triangle) (slant height of each triangle)  =

 

(3/2) ( .4) (.75)   = 0.45 sq ft

 

 

cool cool cool

CPhill  Apr 7, 2017

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