Jul 23, 2025 · 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. It’s …

How to find the third side of a triangle if its two side and perimeter are given? To find the third side of a triangle, if its two sides and perimeter are given, follow the given instructions:

Where a and b are two sides of a triangle, and c is the hypotenuse, the Pythagorean theorem can be written as: a 2 + b 2 = c 2 EX: Given a = 3, c = 5, find b: 3 2 + b 2 = 5 2 9 + b 2 = 25 b 2 = …

In this video I show how to find the length of the third side of a triangle given two sides and the area. The techniques covered in this video include finding the area of a...

SSS means Side, Side, Side. SSS is when we know three sides of the triangle, and want to find the missing angles.

Dec 1, 2025 · This lesson covers using the Law of Cosines to find the third side of a triangle.

An online calculator that calculates the third side of a triangle given its two sides and its area.

Jun 25, 2025 · Once you plug in the given side lengths and the included angle, calculate the cosine of the angle, multiply everything accordingly, and take the square root of the result. …

Feb 16, 2023 · The Pythagorean Theorem is used to find the third side of a right triangle when two sides are given. The theorem is represented as a² + b² = c², where 'a' and 'b' are given sides …

Just like the Law of Sines, the Law of Cosines works for any triangle, not just right triangles. In particular, the Law of Cosines can be used to find the length of the third side of a triangle when …