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6 If this process seems hauntingly familiar, it should. Compare this method to the Bisection Method introduced
in Section 3.3.
Like ‘latus rectum,’ this is also a real math term.
This is the exact same kind of ‘borrowing’ you used to do in Elementary School when trying to ﬁnd 300 − 125.
Back then, you were working in a base ten system; here, it is base sixty. 598 Foundations of Trigonometry angle, the direction of the rotation is important. We imagine the angle being swept out starting
from an initial side and ending at a terminal side, as shown below. When the rotation is
counter-clockwise9 from initial side to terminal side, we say that the angle is positive; when the
rotation is clockwise, we say that the angle is negative. al
in al Si de Initial Side d
e Initial Side A positive angle, 45◦ A negative angle, −45◦ At this point, we also extend our allowable rotations to include angles which encompass more than
one revolution. For example, to sketch...
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