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Mathematics area and volume formula of senior two.
The area of each triangle of the quadrangular vertebra is the root number 1 1, which is the height on the triangle. The square of the height h =12-11,and the square of the height h' (the connecting line between the midpoint and the vertex of the square) of the quadrangular vertebra =

The volume of the pyramid is base area x height /3=(2x2x root number 10)/3.