﻿ Online Triangle Calculator. Enter any valid values and this tool will take it form there!
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Online Triangle Calculator

Enter any valid input (3 side lengths, 2 sides and an angle or 2 angle and a 1 side) and our calculator will do the rest.

Triangle 1

This is the acute triangle in Quadrant I, for more information on this topic, check out the law of sines ambiguous case.

Sides Angles
Side A
$$\angle$$ A
Side B
$$\angle$$ B
Side C
$$\angle$$ C

Triangle 2

This is the obtuse triangle in Quadrant II, for more information on this topic, check out the law of sines ambiguous case .

Sides Angles
Side A
$$\angle$$ A
Side B
$$\angle$$ B
Side C
$$\angle$$C

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 .

Status: Calculator waiting for input

Why is the calculator saying there's an error when there shouldn't be?

The most frequent reason for this is because you are rounding the sides and angles which can, at times, lead to results that seem inaccurate. In these cases, in actuality , the calculator is really producing correct results. However, it is then rounding them for you- which leads to seemingly inaccurate results and possible error warnings. To see if that is your problem, set the rounding to maximum accuracy.