square
right angled triangle
I will rephrase your question as "What shape has only three right angles?" A shape is a 2D drawing that encloses some space. The sum of the angles must exceed 270 degrees. A rectangle is out of the question as it has four right angles. But a 5 sided shape with unequal sides (irregular pentagon) or higher number of sides is fine. I wish Wikipedia would let draw on these answers, because I could draw hundreds of shapes with three right angles. When we talk of shapes, the most regular shapes come to mind, triangles, squares, pentagons, etc. But you did not spcify that my shape had to have straight sides. Imagine, for example, a circle which I will break at three places and insert right angles. Weird, but it does have three right angles. Do the right angles have to face in towards the center? I could even draw a more bizarre shape with with three right angles facing out, connected by curved lines.
Oh honey, we're talking about rectangles here. They're like the cool kids of the quadrilateral world with their four sides and two right angles. So next time you see a shape with those specs, just remember it's a rectangle strutting its stuff.
triangle
triangle in 3dQuadrilaterals in general have four sides and four angles. Rhombuses, trapezoids, parallelograms, squares, rectangles, and other similar shapes are included among these.
A rhombus has four equal sides but no right angles.
A shape with 4 right angles and 4 equal sides is a square. ==========================
what shape has 4 right angles and 2 pairs of equal sides?
A square has 4 equal sides with 4 right angles.
Rectangle
Trapezoid :)
octogon
A rectangle has two sets of two equal sides and four right angles.
A rhombus has 4 sides of equal length, opposing parallel sides, and no right angles
You don't tell us enough information. In a square, there are four sides and four angles. The sides are all equal and the angles are all right angles. In a rectangle, there are four sides and four angles The opposite sides are equal and the angles are all right angles. There is no other shape in which all angles are right angles.
A parallelogram.
Rhombus