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congruent triangles
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classifying triangles by sides

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... * reminds the students what they have learned in the previous class; * lets the students know what the objectives of this lesson are; * organizes the students for the activity: o forms groups of four students; o each student in the groups is asked to prepare a worksheet with various examples of one ...
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Geometry Midterm Review Fall 2015 new format

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The sum of the central angles of a circle is 360.

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History of trigonometry

Early study of triangles can be traced to the 2nd millennium BC, in Egyptian mathematics (Rhind Mathematical Papyrus) and Babylonian mathematics.Systematic study of trigonometric functions began in Hellenistic mathematics, reaching India as part of Hellenistic astronomy. In Indian astronomy, the study of trigonometric functions flowered in the Gupta period, especially due to Aryabhata (6th century CE). During the Middle Ages, the study of trigonometry continued in Islamic mathematics, hence it was adopted as a separate subject in the Latin West beginning in the Renaissance with Regiomontanus.The development of modern trigonometry shifted during the western Age of Enlightenment, beginning with 17th-century mathematics (Isaac Newton and James Stirling) and reaching its modern form with Leonhard Euler (1748).
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