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Multiplication table

Multiplication table 20 × 20 gives the opportunity to multiply their arbitrary natural numbers (1-20).
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Weighted average ratings

The calculator calculates the weighted average of the ratings of the following items.              
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Conversion between number bases

Converter allows you to convert numbers between number bases - binary (binary), trójkowym, czwórkowym, Friday, szóstkowym, siódemkowym, octal (octal), dziewiątkowym, decimal (decymalnym) jedenastkowym, dwunastkowym, trzynastkowym, czternastkowym, piętnastkowym, hexadecimal (hex). Typed characters that are not numbers and the letters A, B, C, D, E, F are ignored.      
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Trigonometric functions calculator

Calculator by entering an angle in degrees or radians calculated values ​​of the basic trigonometric functions.
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Field of the cylinder and

Jak obliczyć pole walca?
Jak obliczyć objętość walca?
Calculator based on the introduced: the radius of the cylinder base and calculates the area and volume.              
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Area of a rhombus

The calculator can calculate the area of a ​​rhombus.
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Battery charging time calculator

Calculator to the data calculates the estimated time of charging.            
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The geometric mean

Calculator based on the entered numbers separated by commas calculates the geometric mean.        
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NIP correctness in Poland

Jak sprawdzić poprawność numeru NIP?
Verifier allows you to validate the tax identification number entered