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An equilateral triangle is a triangle in which all three sides are equal. An example is a triangle with 60o in all three corners.
3 All triangles have 3 corners which are their vertices and it is the plural of vertex.
triangle
the three corners of a triangle always equal 180° , so the angles have to be 60 ° and 60 is an acute angle.
A right triangle has 3 corners, or vertices.