GeoGebra

In summary...

作者:Ryan Smith
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There is also a trick to help you remember, check out the image below.
The "S" can be connected to look like an 8 from 180[math]^\circ[/math] and the "C" can have a line added to look like a 9 from 90[math]^\circ[/math].
The "S" can be connected to look like an 8 from 180 and the "C" can have a line added to look like a 9 from 90.

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