Yes.
A Square!
square
Yes
Examples of cuboids include everyday objects such as a brick, a shoebox, and a standard cereal box. Each of these items has six rectangular faces, with opposite faces being equal in size. Additionally, furniture like a rectangular table or a bookshelf can also be considered cuboids due to their similar geometric shape.
270
No, a rectangle has opposite side which are equal in length.
All quadrilaterals have two [pairs] of opposite sides and in most cases they are not equal.
Equilateral
The answer depends on what shape the question is about.
Quadrilaterals
Yes, a parallelogram has four sides and four internal angles, the opposite side lengths are equal and the opposite angles are equal.
sine