Brocklesby, John, 1811-1889. [from old catalog] · New York, Sheldon and company · leaf 30
ieths (40eV) of an inch, ABCwould be an angle of forty degrees and nine minutes(40° 9/.) Degrees are denoted by the following char-acter, °; minutes thus, ; and seconds thus, . 12. A Eight Angle. A right angle contains 90°,and can be thus constructed. Draw two diametersthrough any circle, dividing… … RIGHT ANGLE. How is its size computed 1 Describe from the figure. How are degrees, minutes, anaseconds denoted 1 What is a right angle, and how is it constructed 1 EXPLANATORY CHAPTER. 19 lams ninety degrees. Thus, in Fig. 3, the two diame-ters, AB and DE, dividing the circumference of the…
Astronomy
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