A regular pentagon has five congruent interior angles so yes :)
rectangle
Trapezoid
None normally unless it's an isosceles trapezoid then it will have 1 pair
It was named after a pentagon, it wasn't the 'Pentagon' that named the 'pentagon'.
A rhombus, or a square if there's a right angle. ( if there's one, there must be 4!)
is a regular pentagon if all its angles are congruent and is a general pentagon if they are not.
it has one obtuse angle and none of the sides are congrent
nothing
square
isosceles
No.
a square
Equal base angles
rectangle
Trapezoid
-1
We call it equilateral.