PDF chapter test TRY NOW
A triangle has three sides, three vertices, and three angles. A triangle with vertices \(A\), \(B\), and \(C\) is denoted as \(△ABC\).
![main image.png](https://resources.cdn.yaclass.in/9ff01b5c-f59e-4541-af3d-d491e8ef8011/main%20image-w300.png)
Properties of a triangle:
- The sum of the three interior angles of a triangle is always \(180°\).
- The sum of the length of two sides of a triangle is always greater than the length of the third side.
The first property of the triangle: The sum of the three interior angles of a triangle is always \(180°\).
![triangle(1).png](https://resources.cdn.yaclass.in/7e2cc5f8-9d38-4865-933a-355a55841378/triangle%281%29-w300.png)
\(∠A\) \(+\) \(∠B\) \(+\) \(∠C\) \(=\) \( 180°\).
The second property of triangle: The sum of the length of two sides of a triangle is always greater than the length of the third side of a triangle.
![triangle(2).png](https://resources.cdn.yaclass.in/c88af110-9ba5-4a0c-bff1-790a9483b070/triangle%282%29-w300.png)
\(AB + BC > AC\) or \(BC + AC > AB\) or \(AB+ AC > BC\).