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11-110.

Convert the following angle measurements from degrees to radians.

$30^\circ$
Answer (a):
This is a special angle. It is one that is worth memorizing!
$\frac{\pi}{6}$

$15^\circ$
Hint (b):
Half of part (a).

$-75^\circ$
Hint (c):
Negative $(30^\circ + 30^\circ + 15^\circ)$

$630^\circ$
Hint (d):
$360^\circ + 270^\circ$

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