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.