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Area of a convex quadrilateral. Example of creating a calculator.

This online calculator calculates area of a convex quadrilateral given diagonal values and value of angle between them. Article also describes the process of creating a calculator.


Area of a convex quadrilateral

Digits after the decimal point: 2
  • Bank card number validation

    The calculator checks a bank card number using Luhn algorithm, it also determines the card issuer according to Issuers handbook.

  • Barometric leveling
  • Base 64 encoding and decoding

    The calculators encode string to base64 string and decode back to original string. Special characters (+/) , generally produced by base64 algorithm, can be replaced by the data provided in additional parameter.

  • Beaufort scale

    Conversion between wind speed measurement units including Beaufort numbers, km/h, m/s, mph, fps.

  • Bernoulli trials table

    This online calculator calculates probability of k success outcomes in n Bernoulli trials with given success event probability for each k from zero to n.

Bayes’ theorem

This online calculator calculates posterior probabilities according to Bayes’ theorem.


Bayes’ theorem

Probabilities table

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Digits after the decimal point: 4