Radio Shack TRS-80 Operation Manual page 21

computer Graphics
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Operation Manual
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Figure 7. Clock/Radian Equivalents
Degrees
Radians
Clock Equivalent
0
0 3:00
90
1.57 12:00
180 3.14
9.00
270 4.71
6:00
360
6.28 3:00
Table 4. Degree/Radians/Clock Equivalents
You can draw semicircles and arcs by varying start and
end. If start and end are the same, a point (one
pixel) will be displayed instead of a circle.
end
Center
start
Figure 8. CIRCLE's (-) start, (-) end
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