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A rectangular right isosceles pyramid, with a capacity of 1.5 cups

A rectangular prism, with a capacity of 1.5 cups, the length of the rectangle is 11.5 cm, the width is 8.5 cm what is the surface area? The heights of the triangles is 11.5 cm 

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Maddi, I think you might be mixing 2 problems up.  Is it a prism or a pyramid?
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1 Answer

There are four triangles here
 
two triangles with base 11.5 cm and height 11.5cm
two triangles with base 8.5 cm and height 11.5 cm
 
Surface are = 2x( 1/2 x 11.5 x 11.5)    +    2x(1/2 x 8.5  x 11.5)
 
=>  132.5 + 97.75 = 230.25 cm2
:)