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What is the surface area of this triangular pyramid?

 

 Feb 7, 2021
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We  have  a triangle  that  makes up the  bottom of the figure  with   a  base of 13  and an altitude of 11.3

 

Its  area is    (1/2)(13)(11.3)   =   73.45 cm^2

 

Then we  have  three congruent triangles making up  the  sides  with bases of 13 and  heights  of 9

 

Their combined area   is   3 (1/2) ( 13) (9) =175.5 cm^2

 

So....the total surface area =  73.45  + 175.5    = 248.95 cm^2

 

 

cool cool cool

 Feb 7, 2021

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