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A triangle has three sides, three vertices, and three angles. A triangle with vertices A, B, and C is denoted as △ABC.
Properties of a triangle:
The first property of a triangle: The sum of the three interior angles of a triangle is always 180°.
∠A + ∠B + ∠C = 180°.
The second property of a 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.
AB + BC > AC or BC + AC > AB or AB+ AC > BC.
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