Online Triangle Calculator--Calculates angles and sides of right triangle, draws image of your triangle

This calculator uses 3 main Triangle Formulas

If you supply 3 sides, it employs the law of cosines to find the angles.
If you supply 2 angles and 1 side, it uses either the law of sines or the law of cosines (Depends on which sides and angles you provide).
If you supply 2 sides and 1 angle, it uses either the law of sines or the law of cosines. (This case also on which sides and angles you provide)

Whenever the calculator learns 2 angles, it uses the formula for the sum of the interior angles to calculate the 3rd angle

Triangle Information Complete!

You are done! You do not need to enter any more information!

OK, Make My Triangle

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Invalid Information

Unfortunately, you cannot create a triangle with the information you have entered. To understand why this is the case, you would need to be familiar with the law of sines. In particular, read about the law of sines and no triangles .

Invalid Side Lengths
You did not yet enter 3 valid side lengths. Please enter all 3 side lengths of your triangle.

Error
Your 3 side lengths ( ) are invalid .

Side Lengths of do not adhere to the triangle inequality theorem. which states that the sum of the side lengths of any 2 sides of a triangle must exceed the length of the third side. Read more about this rule here.

Invalid Angle Measurements
The angle measurements that you entered are invalid. Remember the formula for the interior angles of a triangle. This rule states that the sum of the interior angles of a triangle must be exactly 180°.
I am going to change 1 of your angle's measurements from to °. To read more about this rule, click here.