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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.
This article describes process of calculator creation and how to set output value.
This article describes the process of adding translation support to the calculator, so it can be translated into different languages.
This article describes the process of adding custom errors to the calculator
This article describes how to make calculator which outputs results in table format
This article describes how to control visibility of input and output controls in a calculator