To check if it is a right triangle, apply the Pythagorean theorem:

Sat, 02 May 2026 20:02:32 +0000

How to Check If a Triangle Is a Right Triangle Using the Pythagorean Theorem When learning geometry, one of the most fundamental skills students encounter is determining whether a triangle is a right triangle—a triangle that has one 90-degree angle. Fortunately, there’s a reliable mathematical method to verify this: the Pythagorean Theorem. Whether you're solving classroom problems or tackling real-world geometry challenges, understanding how to apply this theorem is essential. ### What Is the Pythagorean Theorem? The Pythagorean Theorem states that in a right triangle, the square of the length of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the other two sides, known as the legs. Mathematically, it’s written as: