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What is the surface area of a regular square pyramid with a slant height of 12 cm and a lateral edge of 13 cm?

A) 100 cm squared

B) 240 cm squared

C) 340 cm squared

D) 640 cm squared

pwolfey  Nov 2, 2017
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Each side will be a triangle with  a height of 12 and a base edge  of 10

 

So,,,,,the sides will be 4 triangles with an area of  4*(1/2)(12)(10)  = 240cm^2

 

And the base area is 10^2  = 100cm^2

 

So...the total surface area is  240 + 100   =  340 cm^2

 

 

cool cool cool

 

 

 

 

 

 

 

 

 

 

 

 

 

 

9

CPhill  Nov 3, 2017

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