A task about pyramid...

From: lg <lukaszgoogle@xxxxx>
Date: Sun, 14 Sep 2008 07:11:19 -0700 (PDT)

hi all,

I have a problem with the task. I should be grateful for any help;]

The base of pyramid is a rhombus on the side of 15cm in length. The
surface area of 720 cm2 side. Side walls are inclined to base pro Pi /
3. Calculate the volume of this pyramid.

thanks in advance

PS: in the textbook the answer is 1440 cm3
.

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