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16.2 Arc Length and Radian Measure
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Arc Length- understood to be the distance along a circular arc measured in linear units (such as feet or centimeters)
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Formula Sheet gives: 1 degree = _∏__ radians 180°
How to convert to radian measure? Formula Sheet gives: 1 degree = _∏__ radians 180° 1 radian = 180° degrees ∏ Radian- a unit of angle measure based on arc length. In a circle of radius r, if a central angle has a measure of 1 radian, then the length of the intercepted arc is r units. 2∏ radians = 360° radian ≈ 57°
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1. Convert 180° to radian measure.
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3.Convert ∏ to degrees. 4 4.Convert 2∏ to degrees. 3
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page , 13-19 13. 2∏/9 14. 4∏/9 15. 5∏/9 16. ∏/15 17. 0, ∏/6, ∏/4, ∏/3, ∏/2, 2∏/3, 3∏/4, 5∏/6, ∏ ° °
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