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TRM(;*6METRIC FORMULAE + <br /> B g <br /> ii <br /> a <br /> ;.. a a a <br /> • <br /> i3 t7 db C A b C <br /> Right Triangle Oblique Triangle, <br /> Solution of Right Triangles <br /> t 9 _ For Angle A. sin =a,cos tan= b ,'cot = b,sec= o a <br /> , <br /> 7 c % (liven Required a b> cosec= - <br /> a <br /> fir s . A,B,a tanA=b= cotB,c = a <br /> z ar <br /> a+ a A,B> b sin A= a =cos B,bc—a <br /> a �( T=a�1—a; <br /> A,a B, b, a B=90--A,b=a cot A,a= a ° <br /> sin A. <br /> A, b B, a, c B-900-A,a = b tan A,c= b <br /> V d,e B,a b cos A. <br /> 3 i y B=90•-A,a=a sin A,b=c cos A, <br /> a Solution of Oblique Triangles <br /> . (uvea Required . <br /> A, B, a b c, C b= a sin B <br /> F in A • C= 180°--(A +B), c= asin C <br /> J I b sin A sin A <br /> A, a, b B,'c, C sin B= a ,C= 180°—(A-p•B),a = a sin C <br /> sin A <br /> b, C A, B,o A+B=180°—C,tan;(A—B)—La—b)tan A+B <br /> c = asin C a+ b > <br /> sin A <br /> a, b, o A, B, C s=a+2 <br /> Y be <br /> c + +c, area <br /> sin;B—Y("—aKs�),C=180°—(A+B) <br /> 0. b <br /> Area s=a b = Yes <br /> — <br /> 2 <br /> A, b, c Area b a sin A <br /> area = <br /> 2 <br /> d>B,C,aa <br /> I Area area = 'sin—B si�C <br /> 2 sin d <br /> �. REDUCTION TO HORIZONTAL <br /> Horizontal distance—Slope distance in by the <br /> aY9t9aoe Vent.. asine n¢lee vertical6 . Thus.slopedistanceoo X919.4= <br /> From Table,Page IX.oa go 10+= <br /> . X008 � <br /> Horizontal distance=81&#X.9D6ga3180B ft. <br /> D4 Horizontal d' pe.distance <br /> ve distance times(i—cosine of vertical anQle�With 1the <br /> same figures as in the preceding example,the follow- <br /> 319-4X-0041 <br /> distance Ing result is obtained-Cosine 5010,=. <br /> Wires the rise is known, 318.4X.0041=1.31.319.4-1.31=31&09 ft, 1—'9M—'�• <br /> the horizontal distance is approximately.-the slope dist- <br /> Oe leas the square of the rise divided by twice the slope distance. Thus: slope <br /> =l4 ft, <br /> ve dMance-3026 tL- Horizontal distan 14 14 <br /> oe=300 6-2 X302.6=-'ft6—a32=30228 ft, <br /> . MMB IM U.S.A. <br /> t i <br /> ' <br /> 4 <br /> • • L; / r v ' t <br />