two lines that are not parallel but are in the same plane.
A line is perpendicular if it meets at 90o.
A polygon with 4 sides has 4 angles. All polyhedra have at least 4 vertices so I cannot think of any shape that meets the requirements.
4 angles
None normally but in the form of a rectangle it will have 4 right angles
No because they will form 4 right angles of 90 degrees
yes, it has 4 right angles and 4 sides
Not normally but in the form of a rectangle it does
There is no quadrilateral that meets these requirements. It is, of course, possible for a pentagon (or polygons with 6 or more sides) to have 4 equal sides and only 2 right angles.
The letter "i" in its lowercase form has one right angle, which is found at the junction where the vertical stroke meets the dot. In uppercase form, "I" has four right angles, as it consists of two horizontal lines and one vertical line.
The sides if a square or rectangle?
Yes providing the 4 interior angles add up to 360 degrees
yes if it is a square. squares are rectangles with their 4 sides and 4 right angles, but rectangles are not squares without 4 equal sides