Let's look at the geometric characteristics of a right triangle. But first, please review the definition of Perimeter Of Two-Dimensional Shapes, Definitions Of Exponents, and Definitions Of Square Roots, Angle, and Right Angle.

- A right triangle has two unique features.
- The first unique feature of a right triangle, it
has one interior angle of exactly 90°. In the example below, this is angle
**∠AB**. Also note that the sum of the interior angles is 180°. - The second unique feature of a right triangle
is the length of the triangle opposite
**∠AB**is computed from the lengths of**sides A**and**side B**. In the example below, the length of side C is the square root of A^{2}plus B^{2}plus the length of side A and side B. - Special note, all side of an right triangle must be greater than zero.

**Perimeter Of A Right Triangle Formula**

Formula = Side A + Side B + Square-Root(Side A^{2} + Side B^{2})
=

Formula = A + B + Square-Root(A^{2} + B^{2}) =

Formula = A + B + √(A^{2} + B^{2})