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Insulation of wall

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Calculator allows you to calculate the amount of insulation panels needed to cover the walls of the building using the "light wet" or "dry light" methods.
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Rainwater tank

The calculator calculates the amount of collected rainwater from the roof of the given dimensions. Long description      
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Calculate the factorial using Stirling's formula.

The calculator calculates the approximate value of the motor using Stirling's formula      
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Number of tetrahedral

Tetrahedral numbers are the natural numbers, for which it is possible to construct a tetrahedron formnego of bullets. They are a special case of the pyramidal numbers.        
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How far was struck by lightning

Calculator based on the specified time from seeing lightning until you hear thunder in the distance calculated discharge occurred.