Let's look at the geometric characteristics of an obtuse triangle. But first, please review the definition of Perimeter Of Two-Dimensional Shapes, Angle and Obtuse Angle.

- An obtuse triangle has one unique feature,
at least one of the interior angle is greater than 90°, and the sum of the angles
is 180°. In this example
**∠AB**is greater than 90° by visual observation. - Special note, all sides of an Obtuse Triangle must be greater than zero.

**Perimeter Of An Obtuse Triangle Formula**

Formula = Side A + Side B + Side C =

Formula = A + B + C