Such a shape is impossible - in 2 dimensions. But a tetrahedron (4 sided polyhedron) can. To imagine one, look up at the corner of a room, where 2 walls meet the ceiling. There are 3 right angles there. Now measure out a distance from the corner along each edge and put a dot there, then just connect the dots, with the fourth dot being the corner, and you have a tetrahedron with 3 right angles.
Yes
No. A trapezoid is any four sided shape which has at least two parallel sides. If it is four sided, cannot have exactly four right angles.
A square.
A rectangle.
None. All angles are 108 degrees. Sum of interior angles of n-sided figure = (2n - 4) right angles. In a pentagon this is 540 degrees
A four sided figure with four equal sides and no right angles is a diamond, or a rhombus. If it had four right angles, it would be a square.
no
Yup
Yes
Quadrilateral
Trapezoid
A right [angled] trapezium.
A figure with four equal sides and no right angles is a rhombus. A rhombus is comprised of two acute angles and two obtuse angles.
A 4 sided plane figure with 4 right angles.
A four-sided plane figure with four right angles
A four-sided polygon with all sides equal and no right angles would be a rhombus. A rhombus consists of two acute angles and to obtuse angles.
A right-angled trapezoid