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7-2 - 72.notebook November18,2010 72Sectors interceptedarc...

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7­2.notebook 1 November 18, 2010 Mar 6­8:10 AM 7­2 Sectors Sector­ Region of a circle bounded by a central angle and the intercepted arc. sector Formulas to know : Arclength: s = θ r θ in radians. If theta is in degrees, convert degrees to radians then use formula. Area: k = 1/2 θ r 2 or 1/2 rs θ in radians. arclength (s)
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