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The Saracens also gave to trigonometry its modern form, substituting sines for chords, which had been previously used; they elevated it into a separate science. Musa, above mentioned, was the author of a "Treatise on Spherical Trigonometry." Al-Baghadadi left one on land-surveying, so excellent, that by some it has been declared to be a copy of Euclid's lost work on that subject.
I was much out of health after my husband's death, and chiefly occupied with my children, especially with the one I was nursing; but as I did not go into society, I rose early, and, having plenty of time, I resumed my mathematical studies. By this time I had studied plane and spherical trigonometry, conic sections, and Fergusson's "Astronomy."
He cleared up the tangle in Lydia's trigonometry for her and went over the lost lessons in Shakespeare, all the while with a vague lump in his throat over the wistful eagerness in the blue eyes opposite his, over the thin, red, watersoaked hands that turned the leaves of the books. When Billy called that evening he found Lydia more cheerful than she had been in weeks.
"The question is broad as the ocean, my good friend, and a fitting answer might lead us into abstrusities deeper than any problem in our trigonometry. Was that the stroke of an oar?" "'Twas a land noise. Well, I am no great navigator among the crooked channels of religion.
"No, I don't think there's any question as to his identity." "Have you worked it out by mathematics, dad?" Cub inquired. "Yes, by sines and cosines." "What are sines and cosines?" asked Hal. "You'll find out when you go to college and study trigonometry," Mr. Perry replied.
The other is of the Ajax type. That destroyer is of the Viper type." And so on. There are well-defined architectural lines to every group of ships in the British navy and these silhouettes I learned to know by heart before I was permitted to leave Berlin. Moreover, I had to brush myself up in topography and trigonometry.
"Then I suppose it will be a case of victory for the one that strikes the harder for home." "That's a fine old mind of yours. Don't you ever feel any enthusiasm?" "I do, when the figures warrant it. But I must reckon everything with care before I permit myself to feel joy." "I'm glad I'm not like you, Mr. Arithmetic, Mr. Algebra, Mr. Geometry and Mr. Trigonometry."
As it assumes that the student is already acquainted with the elements of Algebra, Trigonometry, Analytic Geometry, and the Calculus, the successful use of this text-book in the general classes of any academy or college will be good evidence that the Mathematics are there taught more thoroughly than is usual in this country.
He had bought half a dozen acres of land at the head of the creek, a mile above Merry-Garden, and built a whacking great house upon it, full of bathrooms and adorned upon the outside with statues in baked earth to represent Trigonometry and the other heathen gods.
Baskirk," said the young commander, after he had brought his trigonometry into use again. Then it became a very exciting question to ascertain which was the faster steamer of the two. The fog was coming and going in the distance, and at times the land could be just discerned.
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