A triangle has 3 interior angles. The three interior angles of any triangle always add up to 180°.
A triangle has 3 interior angles. In an equilateral triangle, each interior angle measures 60°. When the triangle is not equilateral, the angles can have different sizes, but they always add up to 180°.
The exterior angles of an equilateral triangle each measure 120°. Each interior angle and the exterior angle at the same vertex always add up to 180°.
Example: in an equilateral triangle, 60° + 120° = 180°.
The general formula for the sum of interior angles of any polygon is (n − 2) × 180, where n is the number of sides. For a triangle: (3 − 2) × 180 = 180°.
Click on any element to learn more.
