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This is a rectangle, or the special case of the square (all sides equal).
It is an isosceles triangle; and if it has a 90 degree angle and two 45 degree angles then it is an isosceles right angle triangle.
If each angle is 90 degrees the shape is called a square.
A rhombus
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.