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 STANDARD G.C.B.5Derive using similarity the fact that the length of the arc intercepted by an angle is proportional to the radius, and define the radian measure of the angle as the constant of proportionality; derive the formula for the area of a sector.  Radian introduced only as unit of measure. WORKSHEETS Regents-Arc Length 1 GEO/A2/B/SIII arc length 1/7/6/5 PDF Regents-Arc Length 2 GEO/B/SIII central angle 1/4/8 PDF Regents-Arc Length 3 A2/B/SIII radius 1/5/14 PDF Regents-Sectors GEO/B 7/1 Practice-Arc Length 13 Practice-Sectors 9 VIDEOS Finding the length of an arc VID Finding the area of a sector of a circle VID Finding the area of a segment of a circle

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