Ptolemy used chord length to define his trigonometric functions, a minor difference from the sine convention we use today. In the 2nd century AD, the Greco-Egyptian astronomer Ptolemy (from Alexandria, Egypt) constructed detailed trigonometric tables ( Ptolemy's table of chords) in Book 1, chapter 11 of his Almagest. In 140 BC, Hipparchus (from Nicaea, Asia Minor) gave the first tables of chords, analogous to modern tables of sine values, and used them to solve problems in trigonometry and spherical trigonometry. In the 3rd century BC, Hellenistic mathematicians such as Euclid and Archimedes studied the properties of chords and inscribed angles in circles, and they proved theorems that are equivalent to modern trigonometric formulae, although they presented them geometrically rather than algebraically. The ancient Nubians used a similar method. They, and later the Babylonians, studied the ratios of the sides of similar triangles and discovered some properties of these ratios but did not turn that into a systematic method for finding sides and angles of triangles. Sumerian astronomers studied angle measure, using a division of circles into 360 degrees. Send us feedback.Hipparchus, credited with compiling the first trigonometric table, has been described as "the father of trigonometry". These example sentences are selected automatically from various online news sources to reflect current usage of the word 'blistering.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. 2022 Inflation has proven to be one of the most blistering features of the pandemic recovery, one that weighs directly on households across the country. Russ Wiles, The Arizona Republic, 13 Mar. Christopher Arnott, Hartford Courant, Granted, the economy just grew at a blistering 6.9% annual rate in the fourth quarter, but many things have changed since then, including two more months so far in 2022 of continuing high inflation. 2022 Knapp and Alper are smart to surround Renée with a larger-than-expected backing band of seven players, three of whom make up a blistering horn section, anchored by the steady, admirably understated guitar played by Brendan Saadat. 2022 Pera, often cracking a blistering two-hand backhander, bolted to a 4-0 lead in the opening set in less than 15 minutes. 2022 That starting group was also shooting a blistering 61.9% from the field, also the best mark in the league in terms of offensive efficiency. 2022 Just three years ago, the distant sons of Gil Perreault opened with a blistering 8-2-0 mark, and then collapsed over the next 59 games (22-29-8).
2022 In this blistering psychological thriller, a first-year student at Oxford reckons with intergenerational trauma and repressed memory after a spate of flashbacks force her to relive the violence of her volatile mother’s childhood in Singapore. Recent Examples on the Web The blistering social satire, a dramatic comedy set at the fictional White Lotus resort in Hawaii, came into the evening with 20 Emmy nominations, one of the highest tallies for any show.
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