Use A Triangle Calculator To Get Accurate Results!

How to use a Triangle Calculator?

Welcome to Allcalculator.net, your go-to destination for a variety of financial tools and calculators. Explore the versatility of our Triangle Calculator, designed to handle different types of triangles, including equilateral, isosceles, and scalene triangles. While the visual representation in the calculator may appear equilateral, it serves as a general representation. Rest assured, when you input real values, our Triangle Calculator will accurately reflect the shape of the triangle based on the given measurements. Trust Allcalculator.net to provide you with precise calculations and insights for all your triangle-related needs.

Click a side and entry to activate and enter values for any two known sides to calculate the remaining sides and angles.

Sides and angles are being calculated from the current two active entries. In this calculator, the background colour will change to indicate active and inactive entries.

How to calculate the angles and sides of a triangle?

A triangle is determined by 3 of the six values or at least one side. 
Fill in three of the six fields with at least one side
Press the calculate button
A third determines the triangle, and the others are overwritten.

• Three sides
• Two sides' in one angle
• One side in two angles

What are the facts of the triangle?

• A Triangle can't have more than one vertex with an internal angle greater than or equal to 900. It would no longer be a triangle.
• The sum of the lengths of any two sides of a triangle is always larger than the length of the third side.
• Pythagorean Theorem is a theorem specific to right triangles.
• The law of sine is the ratio of the length of a side of a triangle to the sine of its opposite angle is constant.

How do you find angles in a triangle?

To determine the missing angles in a Triangle, you call upon the following theorem:

• The fact that the sum of angles is a triangle is always 1800
• The law of cosines
• The law of sines