Practical plane and solid geometry for advanced students, including graphic statics, adapted to the requirements of the South Kensington syllabus (1899)
Harrison, Joseph, Baxandall, George Albert · London Macmillan · leaf 34
e answer is that we may give theratio of ON toNP, or NP to OP, or ON to OP, or RS toOS, or RS to OS; for then the student may take anyconvenient lengths for the pair of lines, so long as they arein the given ratio. For example, if ON were taken three inches and NPone inch, the same angle would be… … S SA RSORNPOPONOPNPON is called the chord of the angle A OB sine cosine tangent These are abbreviated to cho AOB, sin AOB, cos AOB,and tan AOB respectively. Thus— cho AOB =sin AOB = cos AOB =tan AOB = RS OR PN hypothenuse OPbase ON chord radius height hypothenuse OP height _ PN base ON Three-figure…
