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Q. Are they called by another name? A. Yes, they are called quadrilaterals, or quadrangles. Q. How many regular tetragons are among those we have mentioned? A. One, that is the square, all the others are irregular tetragons, because their sides and angles are not all equal. Q. By what name would you call the whole of the figures on this board?
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. Q. What do we call these figures that have four sides. A. Tetragons, tetra meaning four.
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