The triangle is a polygon, which is a plane figure with at least 3 sides.
The 3 angles of the triangle always add up to 180 degrees.
Trigonometry is the study of the relationship between the angles of triangles and their sides.
The longest side of a right angle is called the hypotenuse.
There are 6 different triangles: scalene, right, obtuse, acute, isosceles, and equilateral.
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