Rhombus. Because a rhombus has congruent (egual in shape and size) sides, but has no right angles.
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That's an isosceles right triangle.
A shape with 4 right angles and 4 equal sides is a square. ==========================
right angled isosceles triangle
the triangle is called right handed triangle
Angles and sides are congruent when they are identical. A shape with four identical sides and angles is a square.