Wentworth, G. A. (George Albert), 1835-1906 · Boston, Ginn & company · leaf 39
re opposite in direction to themoving radius. Figs. 17-20 show the functions drawn for an angle A OP ineach quadrant taken in order. In constructing them, it mustbe remembered that the tangents to the circle are alwaysdrawn through A and B, never through Af or B. Let the angle AOPhe denoted by x;… … Keeping in mind the position of the points A and J3, we maydefine in words the first four functions of the angle x thus:the vertical projection of the moving radius;the horizontal projection of the moving radius;the distance measured along a tangent to the circlefrom the beginning of the first…
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