Not normally but quite possible in the form of an isosceles trapezoid.
An isosceles trapezoid
If the two sides which are not parallel have equal lengths, then the trapezoid is called an isosceles trapezoid (standard trapezoid has unequal sides). The base angles in an isosceles trapezoid are equal in measurement, also I know that a trapezoid with two nonparallel sides the same length is called an isosceles trapezoid.
square, rectangle and an isosceles trapezoid.
The base angles are congruent in an isosceles trapezoid
Not always but sometimes
yes! But only an isosceles Trapezoid.
If you want to, you can always draw a circle around an isosceles trapezoid and the radius can be half the base of the trapezoid.
no
yes, it would always be
Only when it is an isosceles trapezoid.
yes
Yes, always.
Not normally but quite possible in the form of an isosceles trapezoid.
Only as in the form of an isosceles trapezoid are its diagonals congruent.
They are, yes.
An isosceles trapezoid