| 单词 | straight angle |
| 例句 | “There wasn’t a straight angle in the whole building,” Mr. Easter said. Channel 13 to Open Lincoln Center Studio 2010-04-12T21:42:00Z Citing everything from the Milky Way to a doughnut, Mr. Fujiwara made straight angle tailoring credible, as well as the rounded version of the wind coats that Mr. Miyake invented three decades ago. Special Report: Designers Outline a New Geometry 2010-03-05T19:19:00Z Welding Angle Iron.—Let it be required to form a piece of straight angle iron to a right angle. Modern Machine-Shop Practice, Volumes I and II 2012-03-23T02:00:33.140Z Of the two the former has the advantage, since it is probably more obvious that all straight angles are equal. The Teaching of Geometry 2011-10-12T02:00:52.133Z In the first place it expressly excludes the straight angle, and, indeed, the angles of Euclid are always less than 180°, contrary to our modern concept. The Teaching of Geometry 2011-10-12T02:00:52.133Z This was excluded by the Greeks because their idea of angle required it to be less than a straight angle. The Teaching of Geometry 2011-10-12T02:00:52.133Z Pupils will find it interesting to cut off the corners of a paper triangle and fit the angles together so as to make a straight angle. The Teaching of Geometry 2011-10-12T02:00:52.133Z Such a term is "straight angle," a concept not used by Euclid, but one that adds so materially to the interest and value of geometry as now to be generally recognized. The Teaching of Geometry 2011-10-12T02:00:52.133Z It is very commonly taken as a postulate that all straight angles are equal, this being more evident to the senses, and the equality of right angles is deduced as a corollary. The Teaching of Geometry 2011-10-12T02:00:52.133Z The terms "complement," "supplement," and "conjugate," meaning the difference between a given angle and a right angle, straight angle, and perigon respectively, have also entered our vocabulary and need defining. The Teaching of Geometry 2011-10-12T02:00:52.133Z It is found to be better pedagogy to assume that this follows from the definition of straight angle, with reference, if necessary, to the meaning of the sum of two angles. The Teaching of Geometry 2011-10-12T02:00:52.133Z This might be postponed until after the problem to bisect an angle, since it merely requires the bisection of a straight angle; but considering the immaturity of the average pupil, it is better given independently. The Teaching of Geometry 2011-10-12T02:00:52.133Z |
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