Q. What is this?  A. A hexagon.  Q. Why is it called a hexagon?  A. Because it has six sides and six angles.  Q. What does hexagon mean?  A. A six-sided figure.  Q. Are there more than one sort of hexagons?  A. Yes, there are regular and irregular.  Q. What is a regular hexagon?  A. When the sides and angles are all equal.  Q. What is an irregular hexagon?  A. When the sides and angles are not equal.

Hept-agon.

Q. What is this?  A. A regular heptagon.  Q. Why is it called a heptagon?  A. Because it has seven sides and seven angles.  Q. Why is it called a regular heptagon?  A. Because its sides and angles are equal.  Q. What does a heptagon mean?  A. A seven-sided figure.  Q. What is an irregular heptagon?  A. A seven-sided figure, whose sides are not equal.

Oct-agon.

Q. What is this?  A. A regular octagon.  Q. Why is it called a regular octagon?  A. Because it has eight sides and eight angles, and they are all equal.  Q. What does an octagon mean?  A. An eight-sided figure.  Q. What is an irregular octagon?  A. An eight-sided figure, whose sides and angles are not all equal.  Q. What does an octave mean?  A. Eight notes in music.

Non-agon.

Q. What is this?  A. A nonagon.  Q. Why is it called a nonagon?  A. Because it has nine sides and nine angles.  Q. What does a nonagon mean?  A. A nine-sided figure.  Q. What is an irregular nonagon?  A. A nine-sided figure whose sides and angles are not equal.

Dec-agon.

Q. What is this?  A. A regular decagon.  Q. What does a decagon mean?  A. A ten-sided figure.  Q. Why is it called a decagon?  A. Because it has ten sides and ten angles, and there are both regular and irregular decagons.

Rect-angle or Oblong.

Q. What is this?  A. A rectangle or oblong.  Q. How many sides and angles has it?  A. Four, the same as a square.  Q. What is the difference between a rectangle and a square?  A. A rectangle has two long sides, and the other two are much shorter, but a square has its sides equal.

Rhomb.

Q. What is this?  A. A rhomb.  Q. What is the difference between a rhomb and a rectangle?  A. The sides of the rhomb are equal, but the sides of the rectangle are not all equal.  Q. Is there any other difference?  A. Yes, the angles of the rectangle are equal, but the rhomb has only its opposite angles equal.

Rhomboid.

Q. What is this?  A. A rhomboid.  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.