That depends on what type of triangle it is because there are equilateral, isosceles, right angle, obtuse or scalene and they each have different properties.
But what they all have in common is that they have 3 sides, 3 interior angles that add up to 180 degrees and 3 exterior angles that add up to 360 degrees
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angle is the basic part of triangle
equilateral triangle , isosceles triangle , scalene triangle
nonononono
the area is you you people you get
a perpendicular line.