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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.
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.
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.
The layers of the log, formed by each year's growth, would indicate the canals and the intervening spaces covered with buildings. The heart of the city, however, is irregular. "Each of these canals is situated in the centre of a broad street. The Keizers Gracht, or Canal, is one hundred and forty feet wide. They are not circular, but form the sides of an irregular decagon.
The Gothic king was buried outside Ravenna upon the north-east and in the mighty tomb a truly Roman work that the Romans, at his orders, had prepared for him: a marvellous mausoleum of squared stones in two stories, the lower a decagon, the upper an octagon covered by a vast dome hewn out of a single block of Istrian marble.
But the children wanted to know all the names, taking pleasure in learning even the most difficult, such as trapezium, and decagon. They also show great pleasure in listening to the exact pronunciation of new words and in their repetition. Early childhood is, in fact, the age in which language is formed, and in which the sounds of a foreign language can be perfectly learned.
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