If a triangle has side lengths 6, 8, 10 is it a right triangle?
We calculate the squares of the two littlest sides and add them :
We now calculate the square of the biggest side :
They are equal, and thus, the triangle is a right triangle.
When the side lengths of a triangle are in the ratio 3: 4: 5, then it is a right triangle.
These sides are 6: 8: 10, then the triangle is a right one.