Question 1178189
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Use the Heron's formula to find the area of the base triangle.


On Heron's formula see everywhere;  for example,  you may look into the lessons 

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/Surface-area/-Proof-of-the-Heron%27s-formula-for-the-area-of-a-triangle.lesson>Proof of the Heron's formula for the area of a triangle</A>  

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/Surface-area/One-more-proof-of-the-Heron%27s-formula-for-the-area-of-a-triangle.lesson>One more proof of the Heron's formula for the area of a triangle</A>  

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/word/geometry/Solved-problems-on-area-of-triangles.lesson>Solved problems on area of triangles</A>  

in this site.


To facilitate the boring calculations, you may use an online calculator

https://keisan.casio.com/exec/system/1223267646



In any case, &nbsp;the area of this triangle is  about &nbsp;52.788 cm^2  &nbsp;&nbsp;(rounded).


Hence, &nbsp;the volume of the right prism is the product


    Volume = 52.788*20 = 1055.76 cm^3. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<U>ANSWER</U>
</pre>

The problem is just solved.



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The post by @josgarithmetic makes no sense,


so you better ignore it, for your safety.



He simply doesn't know definitions of terms related to this area.