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Express the following angle in radians: 25 deg 30' 30" (25 degrees, 30 arcminutes, 30 arcseconds).

1. 0.4452 rad
2. 0.4363 rad
3. 0.1571 rad
4. 0.8901 rad

Correct answer: 0.4452 rad

Solution

Reduce the angle to decimal degrees, then apply the degree-to-radian factor pi/180.

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