Q. What is this? A. A square. Q. Why is it called a square? A. Because all its angles are right angles, and its sides are equal. Q. How many angles has it? A. Four angles. Q. What would it make if we draw a line from one angle to the opposite one? A. Two right-angled isoceles triangles. Q. What would you call the line that we drew from one angle to the other? A. A diagonal. Q. Suppose we draw another line from the other two angles. A. Then it would make four triangles.
Pent-agon.
Q. What is this? A. A regular pentagon. Q. Why is it called a pentagon? A. Because it has five sides and five angles. Q. Why is it called regular? A. Because its sides and angles are equal. Q. What does pentagon mean? A. A five-sided figure. Q. Are there any other kinds of pentagons? A. Yes, irregular pentagons? Q. What does irregular mean? A. When the sides and angles are not equal.
Hex-agon.
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.