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A triangle has \(3\) sides, \(3\) vertices, and \(3\) angles. A triangle whose vertices \(A\), \(B\), and \(C\) referred to \(△ABC\).

Properties of a triangle:

**The first property of a triangle**: \(180°\) is always the sum of the three interior angles of a triangle.

The three angles of the \(△ABC\) are \(∠A\), \(∠B\), and \(∠C\).

As per the property, the sum of the three angles of the \(△ABC\) is \(180°\).

That is, \(∠A + ∠B + ∠C = 180°\).

**The second property of a triangle**: The sum of the length of a triangle's two sides is always greater than the length of the triangle's third side.

The three sides of the \(△ABC\) are \(AB\), \(BC\) and \(AC\).

As per the property, the sum of the length of any two sides of an \(△ABC\) is always greater than the length of the third side of the \(△ABC\).

Let the two sides are \(AB\) and \(BC\), and the third side is \(AC\).

Thus, we have \(AB + BC > AC\).

Similarly,

\(BC + AC > AB\) or

\(AB + AC > BC\).