Triangles are one of the most important shapes in geometry. They have three sides, three angles, and many useful properties that help us solve mathematical problems.

In this activity, students will explore key triangle properties such as angle sum, triangle inequality, and types of triangles. They will apply these concepts through short interactive exercises designed to reinforce understanding in a fun and engaging way.

- The sum of the interior angles is 180º
- Triangle inequality: the sun of two sides is greater that the third

Types of triangles:
- Equilateral (all sides equal, angles = 60º)
- Isosceles (two equal sides)
- Scalene (all sides different)

- Exterior angle = sum of two opposite interior angles