Perfect Reasoning by Tiro Phenyo Nkau - HTML preview
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17. The hollow Pyramid
The hollow pyramid is a hollow three dimensional shape that exists as four triangles at its top and a rectangular or square shape at its bottom. The total area of this type of pyramid can be noted as the area of the front triangle multiplied by two plus the area of the left triangle multiplied by two plus the area of the pyramid's base.
Measurement Formula: (Front Triangle's area × 2) + (Left Triangle's area × 2) +
Area of the pyramid's base