isosceles triangle
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An isosceles triangle has three sides, two of which are exactly equal in length.
it's a triangle (three sides) with two sides having equal lengths and angles
An isosceles triangle.
A three sided polygon in which two sides are equal in length and two angles are equal in size.
It is impossible to have a two-sided regular polygon with equal length sides. The two sides would merely form an open angle, with no closed third side.