Maryland institute handbook . TRIANGLES Their Use and Solution—Any figure bounded by threestraight sides as A-B, B-C,C-A, joined at their endsforms a triangle. Inside the /\ figure (see Fig. 23a) an angle is formed between each sideand the side adjacent to it, or three (tri) angles a, b, c,as the name triangle implies. A triangle consists of sixparts as follows: 3 sides A-B, B-C, C-A and 3 angles a,b, c. If three of the parts are known the other three maybe found, provided one known part is a side, otherwisewe could find only the proportionate relation of the sidesbut not their numerica
Maryland institute handbook . TRIANGLES Their Use and Solution—Any figure bounded by threestraight sides as A-B, B-C,C-A, joined at their endsforms a triangle. Inside the /\ figure (see Fig. 23a) an angle is formed between each sideand the side adjacent to it, or three (tri) angles a, b, c,as the name triangle implies. A triangle consists of sixparts as follows: 3 sides A-B, B-C, C-A and 3 angles a,b, c. If three of the parts are known the other three maybe found, provided one known part is a side, otherwisewe could find only the proportionate relation of the sidesbut not their numerical An angle is defined by the divergence, expressed indegrees, between the two sides forming it. If any line istaken as a radius and caused to make one revolution, itwould describe a circle or would have passed through360 spaces called degrees (°). This is true whether theline be short or long(see Fig. 23B). It may also be readilyobserved by comparing the dial of a watch with that of atower clock—the minute hand in each covers the 12-hour 58 Triangles space in one revolution. A circle, therefore, contains360°; and for purposes of making more exact computa-tions each degree is divided into 60 parts called minutes() and these again subdivided into 60 parts calledseconds (), so that a circle contains 360° (degrees) or21,600 (minutes) or 1,296,000 (seconds). In one-half circle (semi-circle) A to C, there are 180°,and in a quarter circle or right angle (from A to B) thereare 90° (see Fig. 23C). The sum of the three angles in atriangle is equal to 180°. Proof: In the triangle A, B, C,s
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectmechanics, bookyear19
