Finding volume of Square pyramid

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Kirito123
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Homework Statement


upload_2016-7-29_19-49-13.png


Homework Equations


V= a21/3 h

The Attempt at a Solution


upload_2016-7-29_19-48-25.png

I may be wrong or right I don't know. I'm pretty sure I did it right.
 
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O its 73cm my bad
 
other then that is the way i did it correct?