Triangles are
polygons with the least possible number of sides (three).
The three internal
angles of a triangle always add to 180 degrees.
An equilateral
triangle has three sides of equal length and three equal angles.
An isosceles
triangle has two sides of equal length and two equal angles.
A scalene triangle
has no sides of equal length and no equal angles.
A right angle triangle
has one angle that is 90 degrees.
An obtuse triangle
has one angle larger than 90 degrees.
An acute triangle
has angles that are all less than 90 degrees.
The longest side
of a right angle triangle is called the hypotenuse, it is always found opposite
the right angle.
Trigonometry is
the study of the relationship between the angles of triangles and their sides.
Triangle shapes
are often used in construction because of their great strength.
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