a triangle is a polygon with three sides.
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A triangle with three sides is a polygon.
A scalene triangle has three unequal sides An equilateral triangle has three equal sides
That is the definition of a triangle. If it did not have three sides it would not be a triangle. If it did not have three angles, it would not be a triangle.
In terms of the length the sides of a triangle it can be classified into three types:if all three sides are equal then the triangle is an equilateral triangleif only two sides are equal then the triangle is an isosceles triangleif none of the three sides are equal then the triangle is called a scalene triangle
A triangle has three sides !