An equilateral triangle has 3 equal sides and 3 equal interior angles (of 60o.)
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A square is a two-dimensional shape with four equal sides and four right angles.
This is a rectangle, or the special case of the square (all sides equal).
i think its a PARALLELOGRAM
It is an irregular quadrilateral. It cannot have any parallel sides.
A four-sided shape with one right angle is a quadrilateral. There is no more specific term, unless it has more than one right angle or has equal sides.