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TRIGONOMETRIC FORMULAE <br /> B" Q B <br /> rl 'l l d a <br /> a o <br /> a <br /> A <br /> �ba A C <br /> S W7Right Triangle Oblique Triangles ^- r <br /> q /o° Solution of Right Triangles <br /> • 1 L f" Z�' F°r AngF°a on =a,cos—A,t.— b,cot = a.sec=b. cosec_ °—a <br /> Given Required <br /> d a,b. .A,B,o. tanA=b= cotAa = a + s = ta 1 + <br /> a <br /> 5 <br /> 0­0 <br /> a, e. A,B, b min =cosB,bo�-a a—a) =a`�1— <br /> - V <br /> B=9tl°—d,b=a cotA,a= a <br /> sin A. <br /> : <br /> rl d,b B,a, a . B=90°—A,a 777erfr <br /> b tan A,o= cos / 6 a t v <br /> A, <br /> a'-. B,a, b I B=900—A,a=e sin A,b=o cos A, �9 3%.A.1 <br /> Solution of Oblique Triyangle& <br /> Given� Repaired _a sin B <br /> 3 7 i o 7 d' A a b, o, �' b sin A ' C= 180°—(A+B), a _ a sin C <br /> 3 sin A ,. <br /> X4e. L/ L � bsinA <br /> A, a, b B,a, C sinB== a ,a= 180°—(A 1-B),a _ a sin C <br /> 3. 'f / sin A <br /> a b, C A, B,a A+B-1800—C,tan j(A-B)_ a—b)tan#(A+B) <br /> a + b , <br /> a = <br /> a-Sha C <br /> sin A <br /> B, C a—aa,sin A— <br /> 2 be , <br /> sing=J(a—aa ,C-180°—(A+B) <br /> Area a=a 2 area =V7(8—.TF— J <br /> (a—a a— ) .__ <br /> A, b, o Area Brea = b a sin A <br /> 2 <br /> VO A,B,C,a Area area =a=Sin B sin C <br /> 2 sin A <br /> X REDUCTION TO HOtRIZONTAL <br /> Horizontal distince=Slope distance multiplied by the <br /> cosine of the vertical angle.Thus:slope distance=919.4& <br /> Vert.angle=51 101. From Table,Page IX.cos b°itr= <br /> 9869. Horizontal distance=81&4X.9959=81&o8 ft. <br /> 5�0 Apa1e Horizontal distance also=Slope distance minus slope <br /> Qe distance times (1—cosine of vertical angle). With the <br /> Horizontal distance ing resusame lt figures btained Cosine 6 101==Vii=the ell � <br /> 819.4X.0941=1.81.819.4-1.81=81&09 it <br /> When the rise is]mown,the horizontal distance is approaimat the slope dist <br /> aaee less the square of the rise divided by twice the slope'd=nce us:rise=14 ft., <br /> slope d3 me!1820& Horizontal dlstaace=80¢0--1 4. <br /> t4s-o SS02 28 ft. dt <br /> '- S XIOLB• �� ,, <br /> MAN IN U.e,A. r" <br /> s <br /> dP <br /> • <br /> P <br />