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# What are characteristics of a right triangle?

**A right triangle, also known as a right-angled triangle, always has one angle at 90 degrees.** The side directly opposite this angle is known as the hypotenuse, which is the longest side of a triangle.

If the lengths of two sides of a triangle are known, it is possible to calculate the length of the third side using Pythagoras' theorem. This theorem states that the sum of the square of the hypotenuse is equal to the sum of the squares on the other two sides. This theorem only applies to right triangles.

When a right triangle has sides with lengths that are each an integer, it's called a Pythagorean triangle.

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Q:
## What is the definition of "obtuse triangle"?

A: An obtuse triangle is any triangle that has an angle of more than 90 degrees. This differs from an acute triangle, in which all three angles are less than ... Full Answer >Filed Under: -
Q:
## What are some geometry formulas for triangles?

A: A triangle is a three-sided polygon where the sum of its interior angles equals 180 degrees. Some common formulas for triangles include perimeter, the tota... Full Answer >Filed Under: -
Q:
## How many angles does a triangle have?

A: Every triangle has three angles, and the sum of those angles is always 180 degrees. This is true whether the triangle is an equilateral, isosceles, scalene... Full Answer >Filed Under: -
Q:
## How many degrees are in a triangle?

A: A triangle has three angle that total 180 degrees. In an acute triangle, all three angles are less than 90 degrees. A right triangle has one angle that is ... Full Answer >Filed Under: