A square or rectangle has all right angles.
More complex shapes can also have all right angles, notably forms such as the outline "cross" (e.g. Red Cross), which is an irregular dodecagon having twelve sides. The Greek cross is equilateral, the Latin cross is not.
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It is impossible to have a six sided shape with right angles since the lines would never meet, therefore it would not create a shape. The most right angles you can have in a shape is four. A six sided shape is called a hexagon. There are Regular Hexagons, meaning all the sides and all the angles are equal. Any other Hexagon with unequal sides and angles and called Irregular Hexagons. Each side must be straight, and the sum of the angles equaling 720°.
circles
The shape is all of the following: -- quadrilateral -- parallelogram -- rectangle -- rhombus -- square
A square, by definition, must have four right angles. A plane shape with 4 right angles which is not a square is a rectangle.
Yes. It is impossible for a regular pentagon to have two right angles, but quite possible with an irregular pentagon in which the angles are not all equal. The resulting shape looks like how a child would draw a house.