It's called a rhombus.
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A rhombus is by definition a polygon with four sides of equal length. Since the sum of the internal angles of a polygon with four sides is 360° , a polygon with four sides can have four angles all equal to 90°. In this case we have a particular type of rhombus called square.
No, but an equilateral triangle is a regular polygon with 3 equal sides and 3 equal angles.
A rhombus
square
a rhombus, a quadrilateral without right angle, a quadrilateral with equal opposite parallel sides but no right angles