The Triangle And Its Properties.
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triangle has three sides, three angles, and three vertices. The sum of all internal angles of a triangle is always equal to 180°. This is called the angle sum property of a triangle. ... Any exterior angle of the triangle is equal to the sum of its interior opposite angles.
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A triangle has three sides, three angles, and three vertices. The sum of all internal angles of a triangle is always equal to 180°. This is called the angle sum property of a triangle. ... Any exterior angle of the triangle is equal to the sum of its interior opposite angles.
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