Q.What is the difference between a rhomb and a rhomboid?
A.The sides of the rhomboid are not equal, nor yet its angles, but the sides of the rhomb are equal.
_Trapezoid_.
Q.What is this.

A.A trapezoid.

Q.How many sides has it?
A.Four sides and four angles, it has only two of its angles equal, which are opposite to each other.
_Tetragon_.
Q.What do we call these figures that have four sides.

A.Tetragons, _tetra_ meaning four.

Q.Are they called by another name?
A.Yes, they are called quadrilaterals, or quadrangles.