Pyramid in cube

In a cube with edge 12 dm long we have inscribed pyramid with the apex at the center of the upper wall of the cube. Calculate the volume and surface area of the pyramid.

Correct result:

V =  576 dm3
S =  465.9938 dm2

Solution:

a=12 h=12 V=a2 h/3=122 12/3=576 dm3
h2=h2+(a/2)2=122+(12/2)2=6 513.4164 S2=a h2/2=12 13.4164/2=36 580.4984 S=a2+4 S2=122+4 80.4984=465.9938 dm2



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