How to draw a circular scale( clock )

how to draw a circular scale similar to a clock showing minites graduations/degrees(0,5,…360)?

With trigonometry.

Look on my website have code built with GLUT for a analog clock, not tried it with linux… but should compile from source on my website… my need to add stdlib.h and string.h for linux compile… have to check.
www.angelfire.com/linux/nexusone/

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