Volume of a pyramid is
1/3 base times height
This isn't a conclusive proof of the formula.
However after seeing this, we believe it will be easier for students
to remember the formula for a pyramid's volume.
Start with a cube made from 6 double corner pieces.
Many students know the cubic volume is 
base area times height.
Split the cube into three parts, each of the thirds
a left-right pair of double corners
Now it is easy to see the volume of each pyramid
is (base area*height)/3.
A pyramid & leaning pyramid
with the same base and height
have the same volume.
Slice a pyramid
and scoot the slices.
It still has the same
amount of material and
the same base & height.
Slice finer & scoot again.
You get closer & closer
to a leaning pyramid.
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