General formula for calculating efficiency is given by
Efficiency = (output / input) * 100
It is denoted by greek letter Eta
Efficiency cannot be more than 100%.
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Assuming you meant mechanical, Energy output / Input x 100
The formula for calculating the volume of a hexagonal prism is to take the area of the hexagon, then multiply it by the height of the prism.
c+i+g a+
The answer will depend on what information you have.
the formula for the volume of a cuboid is length x breadth x height