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Triangles A triangle is a three sided plane figure. There are many different types of triangles, they are name according to the slant and angle of their sides. The sum of the three angles of a triangle is always 180 degrees. A right triangle is triangle that contains one 90 degree angle and know equal sides. An equilateral triangle is a triangle that has three equal angles and three equal sides, each angle is 60 degrees. A scalene triangle is a triangle that has no equal angles or equal sides. An obtuse triangle is a scalene triangle with one angle greater than 90 degrees.
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