follows:

* at about 0.14 radians (8.1°)
* at about 0.17 radians (9.9°)
* at about 0.24 radians (14.0°)
* at about 0.66 radians (37.9°)

Slide-rule approximations

Many slide rules - especially "trig" and higher models - include an "ST" (sines and tangents) or "SRT" (sines, radians, and tangents) scale on the front or back of the slide, for computing with sines and tangents of angles smaller than about 0.1 radian.

The right-hand end of the ST or SRT scale

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