Yes, as for example a square is a regular polygon that has 4 right angles.
No.
Any polygon can have at least one right angled - for example a right angled triangle. An example of an irregular polygon with only right angles is a rectangle.
No. A regular polygon has all sides equal and all angles equal. Neither of those properties can be true of a right triangle. A regular triangle is an 'equilateral one'. Its sides are equal, and each of its angles is 60 degrees.
Any polygon can have a right angle. A right angled triangle is an example.
A right angled parallelogram.
A right [angled] trapezium.
There is no specific name, but "right-angled polygon" will suffice.
An isosceles right angled triangle.
regular polygon!!! Crossword right?!?!? Mr.coe's class??
Any polygon can have one right angle, for example, a right angled triangle.
no it isnt
Any polygon can have just one right angle, from a right angled triangle upwards.