Cosine Law Calculator and Solver


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Online calculator, based on the cosine Law , to solve triangle problems. The first calculator solves triangle problems when 3 sides are given (SSS case) and the second calculator solves triangle problems when 2 sides and their included angle are given (SAS case).

The cosine law is given by:

a 2 = b 2 + c 2 - 2 b c cos(A)


or
b 2 = a 2 + c 2 - 2 a c cos(B)


or
c 2 = b 2 + a 2 - 2 b a cos(C)

1 - Solve Triangle Problem when 3 Sides are Given (SSS case)

How to use the calculator

Enter the 3 sides a, b and c as positive real numbers and press "enter". The outputs are the 3 angles A (opposite side a), B (opposite side b) and C (opposite side c) in DEGREES.

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2 - Solve Triangle Problem when 2 Sides and the Included Angle are Given (SAS case)

How to use the calculator

Enter the given angle in A (in DEGREES) and the two sides in b and c as positive real numbers and press "enter". The outputs are side a and 2 angles B (opposite side b) and C (opposite side c) in DEGREES.

Your browser is completely ignoring the <APPLET> tag!


More Online Geometry Calculators and Solvers.

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Updated: 2 April 2013

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