Triangle Calculation

Enter 3 known values and select "Calculate".

Illustration of a triangle

About the page

On this page, you can get help in making your triangle calculations online using the law of sines, law of cosines and pythagoras. At the same time, you also get a drawing of the triangle with the entered information.

The following formulas are used on the page:

Law of sines:

a	=	b	=	c
sin(A)	=	sin(B)	=	sin(C)

Law of cosines:

a² = b² + c² - 2bc cos(A)

b² = a² + c² - 2ac cos(B)

c² = a² + b² - 2ab cos(C)

Pythagoras:

a² + b² = c², where C = 90°

a² + c² = b², where B = 90°

b² + c² = a², where A = 90°

The site is made by Rasmus Bjerner. Any suggestions are welcome, please feel free to send me a e-mail.

	a	b	c
Sides:
	A	B	C
Angles: