Hand book of calculations for engineers and firemen : Relating to the steam engine, the steam boiler, pumps, shafting, etc. . int, as AB and AC, whichmeet in the point A. A« Fig. are measured by degrees. A Degree is one of the three hundred and sixty equal parts ofthe space about a point in a plane. Angles are distinguished in respect to magnitude by the termRight, Acute and Obtuse Angles. A Right A ngle is that formed by one line meeting another, so as to make equal angles with that other. ————— Fig. 44. The lines forming a right angle are perpendicular to each other. Hand Book of C
Hand book of calculations for engineers and firemen : Relating to the steam engine, the steam boiler, pumps, shafting, etc. . int, as AB and AC, whichmeet in the point A. A« Fig. are measured by degrees. A Degree is one of the three hundred and sixty equal parts ofthe space about a point in a plane. Angles are distinguished in respect to magnitude by the termRight, Acute and Obtuse Angles. A Right A ngle is that formed by one line meeting another, so as to make equal angles with that other. ————— Fig. 44. The lines forming a right angle are perpendicular to each other. Hand Book of Calculations. iji An Acute Angle is less than a right angle. Fig. 45. An Obtuse Angle is greater than aright angle. Obtuse and acute angles are also called Fig. 46. oblique angles; and lines which are neither parallel nor perpen-dicular to each other are called oblique lines. The Vertex or Apex of an angle is the point in which theincluding lines meet. An angle is commonly designated by a letter at its vertex;but when two or more angles have their vertices at the samepoint, they cannot be thus distinguished. D. For example, when the three linesAB, A C, and AD meet in the commonpoint A, we designate either of theangles formed, by three letters, plac- Aing that at the vertex between thoseat the opposite extremities of the in-cluding lines. Thus, we say, theangle BAC, etc. PLANE FIGURES. A Plane Figure, in geometry, is a portion of a plane boundedstraight or curved lines, or by both combined. A Polygon is a plane figure bounded by straight lines calledtin -ides of the polygon. The least number of sides that canbound a polygon is three. FIGURES OF THREE Triangle is a polygon having three sides and three is a Latin prefix signifying three; hence a Triangle is liter-ally a figure containing three angles. A Scalene Triangle \± on< in which no twoHides are equal. Fig. 48.
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