Davies, Charles, 1798-1876 · New York and Chicago, A. S. Barnes and company · leaf 13
equal parts .calledminutes, and each minute into 60 equal parts called seconds.The degrees, minutes, and seconds are marked thus ° ; and9° 18 16, are read, 9 degrees 18 minutes and 16 seconds. 29. Let us suppose the circumferenceof a circle to be divided into 360 degrees,beginning at the point B.… … OF LINES. 30. Two straight lines are said to beparallel, when being produced either way,as far as we please, they will not meeteach other. 31. Two curves are said to be parallelor concentric, when they are the same dis-tance from each other at every point. 32. Oblique lines are those which…
Geometry · Plane trigonometry
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