Area of Triangle Using Sine Formula

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An online geometry calculator to calculate the area of a triangle using sine formula when two sides and the angle between them are known (SAS case).

The area of the above triangle may be calculated by one of the three formulas below

Area = (1 / 2)* AC * AB * sin(A)

Area = (1 / 2)* BC * BA * sin(B)

Area = (1 / 2)* CB * CA * sin(C)

depending on which two sides and angle you know.

How to use the calculator

Enter the two sides side 1 and side 2 and the angle between them as positive real numbers and press "enter". The output is the area and the triangle.

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Updated: 25 November 2007 (A Dendane)