Math
Triangles.
Definition
A triangle is a polygon with three sides, three vertices, and three angles that always sum to 180°. Triangles are classified by their sides (equilateral, isosceles, scalene) or by their angles (acute, right, obtuse).
Examples
Real-world.
- 1 An equilateral triangle has three equal sides and three 60° angles
- 2 A right triangle has one 90° angle and is used in the Pythagorean theorem
- 3 Road signs like yield signs are shaped as triangles
Key Fact
The sum of the interior angles of any triangle is always 180°