Elements of geometry and trigonometry. Revised and adapted to the course of mathematical instruction in the United States (1856)
Legendre, A. M. (Adrien Marie), 1752-1833, Davies, Charles, 1798-1876 · New York : A.S. Barnes · leaf 276
ill divide thecircumference into four equal parts, of 90° each. Everyright angle then, as EOA^ is measured by an arc of 90°;every acute angle, as BOA^ by an arc less than 90°; andevery obtuse angle, as FOA^ by an arc gicater than 90°. 6. The complement of an arc iswhat remains after subtracting… … 272 PLANE TRIGONOMETRY. supplement of tlie arc AEF. Tlie sum of an arc and itssupplement-, is equal to 180°. 7. The sine of an arc is the perpendicular let fall fromone extremity of the arc on the diameter which passesthrough the other extremity. Thus, BD is the sine of thearc AB. 8. The cosine of…
Geometry · Trigonometry
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