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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. 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.
No. 8 monitor has on his post a set of geometrical figures, illustrated by the representation of objects either natural or artificial of the same shape; thus a triangle illustrated by one side of a pyramid, a square, a pentagon, a hexagon, a heptagon, an octagon, a nonagon, a decagon.
In another there is a square, together with five rectangles in which the length is always equal to the side of the square while the breadth gradually decreases. In another drawer there are six regular polygons containing from five to ten sides, i.e., the pentagon, hexagon, heptagon, octagon, nonagon, and decagon.
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