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SHA-2 generator

Generates a message using SHA-2 algorithm.
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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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Roots of a quadratic equation

Calculator based on the entered coefficients calculated roots of a quadratic equation.              
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Field and volume of a sphere

Calculator by entering the radius of the sphere is calculated its surface and volume.      
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Associated ceiling material thickribs

Calculator allows you to calculate the approximate consumption of materials per 1 m2 rib ceiling with ceramic and concrete.