Find The Third Side Of A Triangle
Find the missing sides of a triangle using the triangle side calculator. To find the third side when you know two sides and the included angle, you use the Law of Cosines. This law helps relate all three sides of the triangle to one of its angles.
This free triangle calculator computes the edges, angles, area, height, perimeter, median, as well as other values and a diagram of the resulting triangle. One of the most common challenges is calculating the third side of a triangle when two sides and the included angle are known. Our Triangle Side Calculator simplifies this process, providing precise results instantly.
Use our right triangle calculator to find each side, angle, area, perimeter, height, inradius, and circumradius of a right triangle. If you know the length of any 2 sides of a right triangle you can use the Pythagorean equation formula to find the length of the third side. This calculator solves the Pythagorean Theorem equation for sides a or b, or the hypotenuse c.
In this case we find the third angle by using Angles of a Triangle, then use The Law of Sines to find each of the other two sides. See Solving "ASA" Triangles . Our Triangle Calculator helps you quickly find missing sides, angles, height, and area for any triangle typewhether its a right triangle, equilateral, or scalene.
The rule of the sides of a triangle is that the sum of the lengths of any two sides of a triangle is always greater than the length of the third side. This rule is also known as the triangle inequality theorem. TL;DR: To find the third side of a triangle when you know the other two sides, use the Triangle Inequality Theorem (sum of any two sides must be greater than the third).
